单词46（一）

♥alloy:n.[C,U] a metal that is made by combining two or more metals 合金

词汇应用

通过学习化学，我们知道了黄铜是铜锌合金。

意群提示(brass;copper;zinc)

By learning chemistry we know that brass is an alloy of copper and zinc.

♥skyline:n. [C] the shape made by buildings or mountains against the sky(建筑物或群山在天空映衬下的)轮廓(线)，天际线

词汇应用

数以百计的新政府办公楼、公司大厦和居民区，改变了这座城市曾经低矮的天际线。

意群提示(corporate towers; residential compounds) Hundreds of new government offices,corporate towers and residential compounds have transformed the skyline of a once mainly low rise city.

♥terrain:n.[U] an area of land,usu.one that has a particular physical feature(常指带有独特地貌的)地带，地形，地势

词汇应用

这地带一片平坦，多少英里都不见山，也不见高岗。

The whole terrain was flat as a pancake, not a hill or rise to be seen for miles and miles.

♥radar: n.[C,U] a system that uses radio signals for finding the exact position of sth., e.g.an aircraft orship雷达

词汇应用

船上的雷达扫描了前方的海域。

The ship's radar scanned the sea ahead.

♥navigation:n.[U]

①the skill of choosing a path so that a ship, plane,

or car can go in a particular direction,esp.by

Wn maps or instruments 领航术：航术：航②the movement of a ship or an aircraft along a

planned path航海；航空；航行

词汇应用

1. 中国古代的造船和航海术很发达。

2.冰岛周围的浮冰群曾一度对船只航行构成威胁。

1. Shipbuilding and navigation in ancient China were well developed.

2.Pack ice around Iceland was becoming a threat to navigation.

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