名词
中文翻译：第二档
同义词：
['second class', 'second-class']
例句：
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1. The train is running at a slower speed than the first class.
这列火车的速度比头等舱慢。
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2. She was in the second class and didn't have much space.
她坐在二等舱，空间很小。
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3. The second-class seats are usually cheaper than first-class ones.
二等舱的座位通常比一等舱便宜。