齿轮互相啮合.The teeth of the wheel gear into each other.这个大齿轮带动小齿轮使滚筒旋转.This large gear turns the small one to rotate the cylinder.天气冷时齿轮润滑油可能凝结而形成凹槽.Gear lubricants may congeal and channel in cold weather....
Most plants are hermaphrodite, but have mechanisms such as self - INCOMPATIBILITY that promote allogamy.许多植物是雌雄同体的, 但它们存在自交不亲和的机制,从而促进异花受精.Everyone at my school heard it. You were hermaphrodite cheerleader?我的学校里每个人都听过你就是...