After an hour and a half, I pulled my cell phone out to call the friends I was supposed to meet that evening.
一个半小时后,我拿出手机给我那天晚上要见面的朋友们打电话。
The United States invented the modern solar cell over a half century ago.
美国在五十年前就已经研发出了现代太阳能电池。
To record the union of cell and vesicle, the researchers created vesicles and cell membranes with half of a fluorescent compound.
为了观察细胞和囊泡的结合,研究人员在囊泡和细胞膜中各加入一半荧光化合物。
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