基因库(gene pool)
指某一物种在特定时期中能够将遗传信息传至下一代的处于生育年龄的群体所含有的基因总和。
Goods are carried by several of transport--on road or rail, by sea or air.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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