机长的用法和样例：
例句
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当飞机上的灯一下子熄灭时，旅客显得很紧张，但当机长告诉他们这只不过是一次电气故障，很快就会修好时，他们才放下心来。
The passengers became alarmed when the lights went out on the plane, but the captain put their minds at rest when he told them it was only a minor electrical fault and it would soon be repaired.
