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Box section telescopic boom; Telescopic mechanism; Pinless boom; Single cylinder pin type;
箱型伸缩臂； 伸缩机构； 无销式；单缸插销式；
youdao
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She opened the box and took out a pretty pin.
她打开盒子，拿出一枚漂亮的别针。
youdao
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She opened the box and took out a pretty pin.
她打开盒子，拿出一枚漂亮的别针。
youdao