... square stroke ==> 等径冲程 square stroke engine ==> 等行程发动机 square sum of residuals ==> 残差平方和 ...
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One reason for the slipper piston is that, on the short-stroke, over square engine, the piston skirt had to be cut away to make room for the counterweights on the crankshaft.
使用滑裙活塞的原因是：短行程发动机需除去部分活塞裙部，从而为曲轴的平衡重让出空间。
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