livering

例句：

1. 1.The engineer had to replace the old livering with a new one.
   工程师不得不用一个新的来替换旧的。
2. 2. The car's engine was so loud that it drowned out the sound of the livering.
   汽车发动机的声音太大，以至于淹没了活门的声音。
3. 3.The doctor used a livering to relieve the patient's pain.
   医生用一个活门来缓解病人的疼痛。