0 a bar connected to the centre of a circular object such as a wheel that allows or causes it to turn, especially one connecting two wheels of a vehicle -- 軸；車軸
This also constrains the axle of the hinge under the staple.
When the primary axle is spinning and is in such contact with the track, it can be either rolling or sliding on the track.
A string is tied to the axle and the operator controls the motion of the yo-yo by moving it up and down.
The axle is fabricated using one layer of polysilicon.
So, rotation of the axle becomes particularly important if one seeks to avoid possible accumulation of debris where the gap is small.
It had travelled just over seven miles before it suddenly left its path and ended up with a broken axle.
This did not work, and the axle was used as a winch to operate weather balloons.
Yo-yo is a toy made of two discs connected with a thin short axle.
