1. prevent vt.预防; 阻止
例句：Atmospheric conditions often prevent observation of stars.
大气的情况常使人们无法观察星星。

2. appear vi.发表; 出现，显现
例句：I have to appear in court on a charge of drunken driving.
我被控告醉酒驾驶而要出庭受审。

3. urgency n.紧迫; 急迫; 急事
例句：In case of urgency, call the police.
一旦发生紧急情况, 打电话给警察。

4. protect vt.保护，保卫
例句：Game laws protect wild life.
狩猎法保护野生动物。
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