Microscopic examination of a cell's chromosomes can reveal the sex of the fetus.
用显微镜检查细胞染色体可以查出胎儿的性别。
We are now in a crucial course of preparing for the coming College Entrance Examination.
我们正处于备战高考的重要过程中。
We are now in a crucial course of preparing for the coming College Entrance Examination.
我们正处于备战高考的重要过程中。
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