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我们不能用电筒了，因为电池用完了。
We can't use the torch because the battery has run down.
youdao
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在这个时候我才发现我的照相机电池用完了。
Only then to find out the camera was out of batteries. FML
youdao
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他可以符合逻辑地推测，如果蓄电池用完了。
He can logically infer that if the battery is dead then the horn will not sound.
youdao