cloud n. 1.云。 2.云状尘埃、烟(等);(鸟、虫、飞机等的)大群,大队。 3.(水晶等的)雾斑,(镜子等上的)云斑。 4.(显出疑惑、不满、悲哀等的)阴郁脸色;遮暗物,阴影。 5.(编结的质地轻柔的)女围巾。 6.(名誉等的)污点。 a cloud of steam 雾气。 a cloud of dust 一团尘雾。 a cloud of birds (像云一样的)一大群鸟。 a cloud of arrows 一阵稠密的乱箭。 a cloud of words 暧昧话。 be lost in a cloud 烟消云散。 be lost in the cloud 隐入云中。 blow a cloud 〔俚语〕抽烟,吞云吐雾。 cast a cloud (up)on 在…上投下一层暗影。 Every cloud has a silver lining. 乌云朵朵衬白底,黑夜漫漫有尽头;任何困难情况都有可盼的希望。 drop from the cloud 从天而降。 (lose oneself) in the clouds 1. 在云层中;[喻]虚无飘渺。 2. (人)空想,呆想,茫然;(事情)不落实,不现实。 kick the clouds 〔俚语〕被绞死。 on a cloud〔俚语〕满心欢喜,兴高采烈。 under a cloud 不得意,失宠,受嫌疑,遭白眼,处困境。 under cloud of night 趁黑。 wait till the clouds roll by 等乌云散开,等时机到来。 vt. 1.使乌云密布,使变黑暗。 2.在(心)上投下苦恼的[忧愁的]暗影,使心情黯然。 3.破坏(名誉),损伤(友谊)。 face clouded with anger 因为生气而面色阴沉。 vi. 1.云层密布,变黑暗;(镜面等)布满云斑。 2.(心)变忧郁,变黯然(over, up) (脸色)阴沉下来。 adj. -less 无云的,晴朗的。 n. -let 微云,朵云,片云。
The artificial rainmaking ( cloud seeding ) doesn ' t help much 人造雨(云种散播)没发挥什麽多大的作用。
Investigation on catalyst dosage in aircraft cloud seeding in stratiform clouds 层状云飞机增雨催化剂用量研究
The government is using cloud seeding to try to produce rain for farmers , stave off drought and fill water basins 而且政府经常用人工降雨来为农民制造降雨,对抗干旱并且填充水流域。
However , one official admits that although cloud seeding could be effective in preventing light rain on aug . 8 , it could not curb the onset of a moderate to heavy storm 尽管如此,一个官方人士承认,人工降雨可以使他们阻止8月8号比较轻量级的降雨,他们是无法阻止一场形成中的大暴雨的。
First , based on the historical data of 20 years of henan province , the cloud seeding operation cases in april and october in the central region of henan province were evaluated by cluster - analysis - based floating control historical regression method with uniform precipitation and atmospheric precipitable water as meteorological covariates , cluster - analysis - based floating control historical regression method with uniform precipitation as meteorological covariate , and floating control historical regression method ( fcm ) 首先,根据河南省近20年的历史资料,分别用以降水量为协变量的ca - fcm方法、以降水量和整层大气可降水量为协变量的ca - fcm方法和浮动对比区历史回归统计检验方法( fcm ) ,对河南省4月和10月增雨作业进行评估。
Three evaluation methods for the nonrandomized precipitation enhancement operation effects have been developed based on the regional rainfall control and meteorologit cal covariable correlation : dopple ratio analysis evaluation method using regional rainfall ten - dency control for single cloud seeding operation case ; regression analysis evaluation effects on the bases of regional correlation and developing tendency of rainfall ; and multiple regression analysis with meteorological and physical covariables 本文根据区域趋势控制和气象-物理协变量相关设计了三套非随机化人工增雨作业效果评估方案:个例作业区域趋势对比双比分析评估方案、区域趋势相关回归分析评估方案和气象-物理协变量多元回归分析评估方案。
Then , six evaluation methods ( double ratio analysis evaluation method using regional rainfall tendency control for single cloud seeding operation case , regression analysis evaluation effects on the bases of regional correlation and developing tendency of rainfall , multiple regression analysis evaluation effects on the bases of regional developing tendency of rainfall , cluster - analysis - based floating control historical regression method with uniform precipitation and atmospheric precipitable water as meteorological covariates , cluster - analysis - based floating control historical regression method with uniform precipitation used as meteorological covariate , and float ing control historical regression method ) were compared and analyzed with the case of the cloud seeding operation on 5 april 2002 in henan province 然后,以河南省2002年4月5日飞机增雨作业为个例,对作业区域趋势对比双比分析评估方案、区域趋势相关回归分析方案、区域趋势多元回归分析方案、以降水量为协变量的ca - fcm方法、以降水量和整层大气可降水量为协变量的ca - fcm方法和fcm方法6种评价方案进行分析比较。
It was shown from the result of analysis and comparison that the evaluation efficiency for the non - randomized cloud seeding operations could be improved by using appropriate physical covariate as control factor and increasing the correlativity between rainfall distributions in the control area and target area 比较分析的结果表明,只要不断提高对比区和影响区的相关性和引入新的更有效的协变量,就可能提高非随机化作业的效果评估效率,从而更好的检验人工增雨作业的效果。
In the end , cluster - analysis - based floating control historical regression method with uniform precipitation and atmospheric precipitable water as metoorological covariates could more validly evaluate efficiency of cloud seeding operations and significant level of ca - fcm method was higher than the other methods , because it adopted cluster analysis which highly improved the correlativity between rainfall distributions in the control area and target area , and used grid interpolation which enhanced exactness of calculating precipitation rainfall , and chose atmospheric precipitable water as the covariant which increased the inferential accuracy of natural rainfall on the cloud seeding operational area 最后,得到以降水量和整层大气可降水量为协变量的ca - fcm方法,由于采用聚类分析( ca )方法,提高了对比区和影响区相关性;采用网格插值技术提高了雨量的计算准确度;引入了不受催化影响的物理协变量(整层大气可降水量) ,提高了作业区自然降水量估计值的准确性;所以评估效果最好,显著水平高于0 . 05 。