名词短语
中文翻译：沮丧的中心
同义词：
['down-on-the-middle', 'depressed center', 'flatbed wagon']
例句：
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1.The driver was driving the flat wagon whenit suddenly broke down.
司机正在驾驶平底货车时，它突然坏了。
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2. The flatwagon was used to transport heavy loads acrossthe country.
平底货车被用来在全国各地运输重物。
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3. The flat wagon was apopular choice for farmers who needed to transporttheir crops.
平底货车是农民们常用的选择，因为他们需要运输他们的庄稼。