cell span effective 单元格跨距
cell cycle span 细胞周期期间
red cell life span 红细胞寿命
red blood cell life span 红细胞寿命
Similarly, one cell in a column can span more then one row.
同样地，列中的单元格也可以跨多个行。
A cell in a row can span more than one column.
行中的单元格可以跨多个列。
Experts also said people who averaged half an hour a day of cell phone conversations over a span of 10 years had greater odds of developing cancer.
专家们还表示，持续10年以上平均每天使用手机通话半小时的人罹患癌症的几率较高。
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