As you fly up and down the river, you'll see a lot of people have already abandoned their houses and moved to higher ground.

当你在河流中飘来飘去，你会看到很多人放弃了自己的房子，搬到地势较高的地方。

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There were two buttons on the remote controller, one was to make the plane fly up and down and the other was to make it circle in the air.

飞机遥控器上有两个键，一个可以使飞机上下飞，一个可以让飞机在空中旋转。

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The birds fly up and down happily, just like small black seaplanes. Besides them, the arrival of the wild ducks, at much higher speed, is almost majestic.

湖上的鸟儿，快乐地上下翻飞，恍如成群的黑色水上小飞机，忙个不停，除此之外，飞来的野鸭子速度相对迅捷得多，极为壮观。

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Teams don't fly up and down the court 70 or 80 times, as in basketball, where mistakes can be ironed out over the course of a game.

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With their wings beating up to 80 times a minute and their hearts beating hundreds of times a minute, they fly up, down, forwards and even upside down and backwards.

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They discovered some mechanisms such as their exposure on Zillow that could be scaled up and down on the fly, even daily.

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