| 例句 |
Two guards were on watch. = Two guards were standing watch.两名警卫在站岗。One of them was asleep and the other on watch.他们两人一人在睡觉，一人放哨。Some of the crew were sleeping, while others were on watch.一些船员在睡觉，其他的在值班。One of the soldiers is on watch.士兵中的一人在值岗。Apart from two men on watch in the engine-room, everyone was asleep.除了两个人在机房值班外，其他人都在睡觉。 |