单词：air cover
air cover的用法和样例：
例句
- Mayday!Mayday!require air support immediately!呼叫空中支援，呼叫空中掩护。
- For this operation we need plenty of air cover,ie protection by military aircraft.为进行这次军事行动，我们需要充足的空中掩护。
词汇搭配
- air cover空中掩护
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