A few years ago, we started this kind of "favor war" where one of us would do something kind for the other, such as cleaning up the driveway or building a shed, and next time the other would try to top it with another favor.

几年前，我们开始了这种“人情战”，我们中的一个人会为另一个人做一些好事，比如清理车道或搭建棚子，下次另一个人就会试图用另一个人情来顶上。

youdao

Improved technology reduced the amount of time needed for the traditional female work of cleaning and cooking.

改进的技术减少了打扫和烹饪等传统女性家务的所需时间。

youdao

The opportunity cost of apuppy includes not just the purchase price of the puppy, but also the food, veterinary bills, carpet cleaning, and the value of the time spent dealing withthe puppy.

养狗的机会成本不单单是买狗所花的费用，还包括狗粮、请兽医、清洁地毯，和花费在遛狗上的时间。

youdao

But it was a casual event and we all spent a lot of time in the kitchen, cooking and cleaning.

FORBES: Why You Should Take The Blame

Incoming dirty ships would have to transfer their cargo or be cleaned, which takes time, and cleaning the ships could create delays and port congestion.

FORBES: The Gulf Spill: Now What?

Later, Kenya were teetering on the brink on 160 for eight and Nel (2 for 25) wasted little time in cleaning up the tail.

BBC: Scots tumble to defeat by Kenya