primary grain中文什么意思

初生晶粒

• primary:    adj. 1.第一的，最初的，初级的 ...
• grain:    n. 1.谷物，粮食〔英国叫 cor ...
• a grain of:    一点，些微

例句与用法

1. Hang - jia - hu water - net plain is the primary grain production base of zhejiang province . with a high population and intensive land utilization , agricultural non - point source pollution is extremely serious in this region . animal wastes , household cleaning products , farmland runoff and leakage mainly contribute to the anpsp
   杭嘉湖水网平原地区是浙江省主要的商品粮基地，土地利用强度大，人口稠密，农业面源污染严重，其中畜禽粪尿、生活污染、农田径流和渗漏是该地区三大主要的农业面源污染源。
2. Rice is one of the primary grain crops in the world , while the ratio of japonica rice to rice is very low , by 2001 the world sown area of japonica rice was10 , 844 , 860 ha , accounting for 7 . 16 percent of the paddy harvest acreage , and the output of it was 72 . 62 million tons , accounting for 12 . 25 percent of the total rice output
   水稻是世界上重要的粮食作物之一，粳稻在水稻中所占的比重不大， 2001年世界粳稻播种面积为10844 . 86千公顷，占当年稻谷收获面积的7 . 16 ，产量为7261 . 75万吨，占稻谷产量的12 . 25 (笔者根据fao统计资料及其它相关资料推算) 。