When cleaning up the drawer, I found some old photos.
在整理抽屉时，我发现了一些老照片。
Be sure that you do not remove metal when cleaning ring grooves or oil slots.
清洁活塞环槽或油环开缝，绝对不能损伤金属部分。
When the bank contracted out its cleaning, the new company was cheaper.
银行把清洁工作承包出去之后，才发现新的清洁公司报价更便宜。
This should only be done when an intense cleaning is needed.
这应该只在需要做深层清洁的时候才做。
When did you finish cleaning the room?
你什么时候打扫完屋子的?。
We were cleaning the classroom when they came in.
他们进来的时候我们在打扫教室。
Your dentist will be able to remove the prosthesis when necessary for cleaning and maintenance.
在需要清洁和维护的时候，牙医可以将牙桥取下来。
When they have finished cleaning the yard, tell them to was the car.
他们打扫完院子后，告诉他们去洗车。
However when he was cleaning up he found the lottery ticket.
然而当他清理的时候他发现了这张彩票。
Somebody was cleaning the room when I arrived.
当我到达的时候，某人正在打扫房间。
Jessica found some old letters by chance when she was cleaning the room.
杰西卡在清洁房间的时候，偶然发现了一些旧信件。
He was cleaning the room when I went to see him.
当我去看他时，他在打扫房间。
Replace new water and, when necessary, cleaning the sink.
更换新水，必要时清洗水槽。
When the filter room is dirty, cleaning is carried out on its original place.
当过滤室脏后，其清洗是在原位上进行的。
When I came in, he was cleaning the room.
当我走进来的时候，他正在打扫房间。
I was cleaning my room when she came in.
当她近来时我正在清洁我的房间。
I was cleaning the room when my mother came in.
我妈妈进来的时候我正在打扫房间。
They were cleaning the classroom when I left.
我离开时他们正在打扫教室。
When mother was away, I did the cooking and Tom did the cleaning.
妈妈不在家时，我做饭，汤姆搞卫生。
When mother was away, I did the cooking and Tom did the cleaning.
妈妈不在家时，我做饭，汤姆搞卫生。
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