Cells can stop in their lifetime at some point in the cell cycle and persist for long periods of time.
细胞生命期可以停止在细胞周期的某个点,并保持很长时间
Second thing, we started talking about the periodic table and I believe that it's a hallmark of any educated person in the 21st century who is technically literate to know the periodic table by heart.
第二点,我们之前讨论过元素周期表,我相信这是个标志性的特征,对于那些在21世纪里,用心去学习,元素周期表的人来说。
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