备用的
adj. ready
vt. spare
misc. in reserve
双语例句原声例句
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我把钥匙丢了，还没有备用的。
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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.
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目前在我们这里登记备用的护士很少。
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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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