half peripheral length of bearing liner

例句：

1. 1. Thenew design has a half peripheral length of20 cm.
   新设计有20厘米的半外围长度。
2. 2. The car's wheelbase is 5 meters, which is half the peripheral length ofits body.
   汽车的轴距为5米，是车身半外围长度的一半。
3. 3. Theengineer calculated the half peripheral length of thetunnel to ensure it would not exceed themaximum allowable width.
   工程师计算了隧道的半外围长度，以确保它不会超过最大允许宽度。