undercarriages
n.
（飞机的）起落架，车盘，着陆装置( undercarriage的名词复数 );
例句:
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It also a troubleshooting analysis of the undercarriages retractile system.
还包括一次起落架收放系统的故障分析.
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One device, known as a "sally port" will allow police to inspect the undercarriages of all vehicles entering the convention area.
来自CNN