At the time of shedding they contain undifferentiated embryos of no more than a few hundred cells . 在脱落的时候，它们含有不超过几百个细胞而未分化的胚。
These observations were used to calculate the maximum ground temperatures at the time of the explosion . 曾经利用这些观察结果计算在爆炸时地面的最高温度。
Whenever her brother went out at night, she would creep down into the hall at the time of his return . 每当她哥哥晚上出去，在他回来的时候，她总是摸下楼到门厅里。
The words were very apt to my case, and made some impression upon my thoughts at the time of reading them . 这句话对于我非常切合，在读到的时候给了我一个很深的印象。
Orchards should, at the time of flower initiation, receive an added application of nitrogen to stimulate flower determination . 种子园在花孕育时期应增施氮肥以促进花的定型。
In the war between those new governments and spain we declared our neutrality at the time of their recognition . 我们承认这些新政府之时，就已宣告对它们同西班牙之间的战争持中立态度。
Had my hormones been absent at the time of joe's birth, he would have growth into a thick-lipped, flat-nosed dwarf-an imbecile or moron . 如果乔出生时没有我这种激素，他将长成一个厚嘴唇，塌鼻梁的侏儒--一个低能儿或呆子。
In order to recover under this insurance the assured must have an insurable interest in the subject-matter insured at the time of the loss . 在发生损失时，被保险人必须对保险标的物具有可保利益，才能获得本保险单项下的赔偿。
Over two thousand years before, at the time of the tyrant emperor chin shih hwang, who first unified china, built the great wall, repudiated confucius, and burned the books . 二千年前，暴君秦始皇最初统一中国，曾建造了长城并焚书坑儒。
These calculations can be compared with the chemical analyses of meteorites in an attempt to ascertain the conditions in the nebula at the time of their formations . 这些计算可与陨星的化学分析相比较，从而推断在它们形成时星云中的条件。
