With a trigger mechanism, the doctor was able to administer small doses of a sedative as needed.

利用这个机关，医生可以随时给他注射镇静剂。

youdao

With a trigger mechanism, the doctor was able to administer small doses of a sedative as needed.

利用这个机关，医生可以随时给他注射镇静剂。

youdao