If you've ever watched a lifeguard approach a person who is drowning, you will see the lifeguard swim out to the person and then just tread water.

要是你以前看过救生员靠近溺水的人，你会看到救生员游到那个人身边，只是在踩水。

youdao

If you can't get back to the beach, tread water and wave for a lifeguard's help.

假如你无法游回岸边，可踩水并向救生员挥手求救。

youdao

Hey Ben Bernanke, how long can you tread water?

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So if you're willing to indulge a sappiness factor that's off-the-charts, and you don't mind movies that just sort of tread water, The Lake House may be your kind of time-waster.

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Even when not involved in play, as you can't touch the sides or floor of the pool and must tread water.

BBC: Last Updated: Friday October 28 2005 17:05 GMT