Vibratory pile drivers can be extremely economical and therefore the contractors' preferred method of pile driving.
因振动桩锤非常经济，一直受到施工者青睐。
However, pile drivers are too bulky since the bearing condition of the mechanical model of pile drivers is different from that of crane jibs.
但是由于桩架力学模型的支承条件与起重机臂架不同，故桩架显得笨重。
The school is a bunch of makeshift shelter houses. The noise of bulldozers and pile-drivers accompanied our lecturing.
所谓学校其实就是一片简易的板房，外面重建工程机器的轰鸣声成了课堂的伴奏。
The school is a bunch of makeshift shelter houses. The noise of bulldozers and pile-drivers accompanied our lecturing.
所谓学校其实就是一片简易的板房，外面重建工程机器的轰鸣声成了课堂的伴奏。
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