be under order

• 得到命令；奉命

be under order的用法和样例：

例句

1. We set out the instant we got the order.
   我们一得到命令就出发了。
2. He is under orders to leave next week.
   他奉命下周动身。
3. Crockett was asked to be the leader of the defenders of the fort, but he refused.
   克洛基奉命担任堡垒守军的领导者，但他拒绝了。