European peasants would insert a wooden drill in a round hole and rotate it briskly between their palms.
欧洲的农夫将一个木钻子放入一个圆孔并用手掌不停旋转它。
2
Insert Supply Hose into mounting hole.
进水软管装入安装孔。
3
The key to solve the problem lies in the optimal design of clearances between the insert rotary shaft and its bearing as well as the round insert fitted hole.