subs meaning in English

窗框托，副磕
潜水艇

One, an old barque, had been big enough for a sub to bother with and the sub had shelled her .
一条是陈旧的敞篷汽艇，比较大。潜水艇要搞掉它还真得费点儿力气，而它也确实挨了潜艇的炮弹。
If you were sending a u-boat in to pick up a fugitive spy, what would you think was the nearest sub could safely come to the coast ?
如果让你派潜水艇接应一个逃亡间谍，你认为哪是最近最安全的接应点？
L ' m sorry , but l can ' t sub for anyone today
我很抱歉,但今天我不能为别人代班了
Sub - level caving mining with seam of thickness dirt band
含厚夹矸煤层的综放开采
Was there any edit sub - system in the application
那时这个软件中有没有编辑系统

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