Compared to the new wheel tread, the worn tread is easy to form two-point contact nearby the depression area of the nominal diameter position of wheel tread.

与新用车轮踏面相比，测试得到的磨耗后车轮踏面在其名义直径位置凹陷区域附近容易形成踏面两点接触。

youdao

The watches have a dial aperture at the position of the balance wheel to show that the movement inside is mechanical.

FORBES: Fr��d��rique Constant's Heart Beat Manufacture GMT Automatic

Instead of its standard position behind the movement in back of the watch, the 14mm-diameter wheel floats above the movement and dials, encased under the domed crystal on its face.

FORBES: Surprise! The Latest Watch From MB&F Looks (Almost) Normal

The steering wheel deploys back into the driving position when the car is started, the angle of which can be pre-set and saved by the driver.

FORBES: Ready for a Folding Steering Wheel?