1. Pack a valve stem. 
   扎好活门塞
2. An electrically produced graph or tracing. 
   电示图以电制作的图表或映描图
3. He knew they were tracing him. 
   他知道他们正在追踪他。
4. A valve governing fuel intake. 
   控制汽油消耗的阀门
5. Relating to a mitral valve. 
   关于僧帽瓣的

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