axle center的用法和樣例：
例句
- In this cavern are three massive stone wheels, each with a huge pole through its centre as an axle.
洞里有三個(gè)巨大的砂輪，每個(gè)砂輪的中心穿過(guò)一個(gè)巨大的桿作為輪的軸心。 - This short-arc coupled with the low pendulum effect achieved by pivoting the disc through a point near its center of gravity assures rapid closure.
繞軸旋轉的閥瓣的重力中心距軸心較短，因此這種短弧的鐘擺效應也比較小，從而確保能夠迅速關(guān)閉。
