inserted tooth facing milling cutter

例句：

1. 1. The dentist inserted the toothand then removed it.
   牙医将牙齿插入，然后取出。
2. 2. The engineer faced themilling cutter and began to workon the project.
   工程师面对铣刀开始工作。
3. 3. The technician was inserting the toothinto the patient's mouth.
   技师正在将牙齿插入病人的口中。