单词second-tooth
The pinions may be configured for engagement with the pair of side gears and each of the pinions may have a tooth with a second tooth flank.
所述小齿轮可配置成与所述一对半轴齿轮啮合，并且每个小齿轮可具有带第二齿根面的齿。
My second tooth on the left huts.
我左面的第二颗牙疼。