The most recent was just last week when a medical flight carrying a sick patient had to land on its own in Nevada when the pilot couldn't get through to a snoozing controller on night duty.

最近的一次是在上周，由于飞行员不能接通在值夜班时打瞌睡的领航员，一架搭载着一位病人的医务航班不得不自行在内华达降落。

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One pilot said he made several attempts to contact the only controller on duty and had to abort his landing during the final approach.

一名飞行员表示，他多次试图联系当时值班的唯一一名调度员，最后一次不得不取消降落。

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The regular pattern of the resistance of the welding arc duty simulator is designed. And a controller is developed to control the change of resistances.

明确了模拟电弧负载电阻值的变化规律并研制了实现该阻值变化规律的控制器。

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Coached by an off-duty air-traffic controller who requested pretournament tips from, he said, his close friend Jose Mourinho, Cape Verde's team, also known as the Blue Sharks, has lighted up the Africa Cup of Nations.

WSJ: Cape Verde's Surprise Run in Africa Cup