医生给他注射镇静剂。
利用这个机关，医生可以随时给他注射镇静剂。
With a trigger mechanism, the doctor was able to administer small doses of a sedative as needed.
接受检查的羊首先被注射镇静剂保证其不会影响接下来的工作，然后被捆绑着送上输送带，为了保证头部舒适，还要垫上专门的软垫，最后才被慢慢送入扫描仪中。
Sheep are mildly sedated by a vet and then strapped to a conveyor, with head cushion for comfort, before passing slowly through the scanner.
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