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1·He saw many dragonflies hydroplane.

他看见许多蜻蜓飞掠过水面。

2·A hydroplane navigated over the lake.

一架水上飞机从湖面上飞驰而过。

3·The designer of Marine aircraft demonstrated his newest hydroplane.

那个水上飞机设计师演示了他的最新水上飞机。

4·And do not forget we're going up in hydroplane to-morrow morning, at nine o 'clock.

别忘了明天早上九点我们要乘水上飞机上人哩。

5·And do not forget we're going up in the hydroplane to - morrow morning, at nine o 'clock.

别忘了明天早上九点我们要乘水上飞机上人哩。

6·That's why your car may not hydroplane at thirty miles per hour, but might at sixty miles per hour.

那就是为什么你的车不要以三十英里每小时的速度水上飞机似的行驶，而是以六十英里每小时的速度行驶。

7·It was the first time he had called on me, though I had gone to two of his parties, mounted in his hydroplane, and, at his urgent invitation, made frequent use of his beach.

这是他第一次来看我，虽然我已经赴过两次他的晚会，乘过他的水上飞机，而且在他热情邀请之下时常借用他的海滩。