The piece has four beats to the bar.
这首曲子每小节四拍。
Four on the hot bar, one for the left mouse button, and two for the right mouse button.
热键栏可以放4个，鼠标左键可以放一个，右键可以放两个。
Moving leader mechanism is a special style of the planar four-bar mechanism.
移动导杆机构是平面四杆机构的一种变形形式。
Traditional design of a four-bar mechanism is complicated and has larger design error.
传统的连杆机构设计比较繁复，误差也大。
Traditional design of a four-bar mechanism is complicated and has larger design error.
传统的连杆机构设计比较繁复，误差也大。
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