automatic smoke sampler

例句：

1. 1.The car is an automatic transmission.
   这辆车是自动变速器。
2. 2. The machine is automatic in its operation.
   这台机器在操作上是自动的。
3. 3. The automatic door locks automatically when the door is closed.
   当门关闭时，自动门会自动锁住。