名词
中文翻译：返回间隔
同义词：
['revert interval', 'return time interval']
例句：
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1. The car's engine has a return interval of 50 seconds.
这辆车的发动机有50秒的返回间隔。
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2. The train will have a return interval of three hours before it arrives at the station.
火车将在到达车站前3小时有返回间隔。
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3. During the flight, passengers should return their seat belts and maintain a safe distance from the plane's door.
在飞行期间，乘客应该返回座椅并保持与飞机门的安全距离。