1.attempt to 尝试，企图

Your letter is a feeble attempt to hide your intolerance.
你的这封信，是一种试图掩盖你狭隘心胸的苍白举动。

This was an attempt to close that chapter.
这也许是创造新开始的尝试。

2.touch down 降落，着陆

External airbags have been used in the past to help unmanned space landers, including mars pathfinder, touch down.
外部气囊在此之前已经被用来帮助无人驾驶的飞船进行着陆，这其中就包括了火星探路者飞船。

At low tide it is surrounded by a broad flat apron of coral where a plane could safely touch down.
退潮时，这个岛四周是宽阔平坦的珊瑚礁，可以容纳一架飞机安全地降落。

3.fly across 飞过

To fly across israel, it takes three minutes.
而飞越以色列，只需要三分钟。

You can fly across the ocean in a matter of hours and be home the next day if you need to be.
你可以在数小时内便飞越海洋，若需要，隔天又可飞回家中。

4.a number of 许多的；一些

A number of foreign governments condemned the army coup.
一些外国政府谴责马里发生的军事政变。

He masterminded a number of terrorist attacks.
他谋划了许多次恐怖袭击行动。