Cell phones foster social connections with peers across time and space.
手机促进了人与人之间跨越时间和空间的社交联系。
2
The answer is that only a small subset of the genes in a particular kind of cell are expressed, or turned on, at a given time.
答案是特定细胞中只有一小部分基因在特定的时间被表达或使用。
3
He said the Octagon would soon switch to a fuel cell system for heat and electricity, partly to cut energy costs at a time of a depressed rental market.