1. This tree is 3 meters in girth.
   这棵树周长有三公尺。
2. One metre is 3 1/4 feet.
   一米等于三又四分之一英尺。
3. Please board your flight through Gate 3.
   请由3号门登机。
4. Have 2--3 years' computer programming experience.
   须有2—3年的电脑编程经验。
5. It is difficult to get there in 3 hours.
   在三小时内到达那里很困难。

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