adj. ready
vt. spare
misc. in reserve
... equal a. 胜任的,合格的;平等的vt.等于 auxiliary a. 辅助的,补助的;附属的;备用的 vacant a. 空着的;(职位、工作等)空缺的;(神情)茫然的 ...
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我把钥匙丢了,还没有备用的。
如果你将要参加一场重要的考试的话,你最好准备多一支备用的笔。
If you are to have an important exam, you'd better prepare one more pen in reserve.
目前在我们这里登记备用的护士很少。
It's the way to store energy in a place that protects it, packs it away, and keeps it for pregnancy and for nursing the baby, so it's very important from a reproductive point of view.
这样把能量储存在一个地方,保护起来,为怀孕和养育孩子备用,从生殖观点来看这是很重要的
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