名词 dead center:

1. the position of a crank when it is in line with the connecting rod and not exerting torque

deadadj.死的；不起作用的；无趣的；筋疲力尽的；麻木的；完全的；无效的；沉闷的；（指球）界外的adv.完全地；直接地；突然地deadbeatn.赖账者；游手好闲者adj.不摆的；无振荡的