And by learning what it is about economic development or housing that actually helps to improve health, we can then design more programs and ultimately make better use of the knowledge that we have."
VOA: special.2009.07.20
If you had more than fifty minutes, you could actually make ample use of it.
如果你有超过50分钟的教学时间,你大可尝试去做。
One of the main things that we use cell culture or maintenance of cells outside the body for is to make more copies of cells.
我们培养细胞,或者体外维持细胞的重要步骤,就是复制更多的细胞
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