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1·A rowing or paddling stroke in which the oar or paddle is pushed forward, used to check a boat's forward motion or move it backward.

倒浆，把橹或桨向前推以阻止船向前运动或向后移动的一种划船或摇桨方式。

2·Was the backward swing a stroke?

向后挥杆算他打了一杆吗？

3·The backward swing was not a stroke.

向后的挥杆不算做一杆。