to call upon

• 号召； 呼吁； 请求

to call upon的用法和样例：

例句

1. The general's speech was pitched as a call to arms.
   将军的讲话是一个要大家拿起武器的号召。
2. He called on the workers to fight for their rights.
   他号召工人为争取自己的权利而斗争。
3. Police have appealed for witnesses to come forward.
   警方呼吁目击者挺身而出。
4. He turned a deaf ear to all requests for help.
   他不理会一切求援的呼吁。
5. Henry got a stomachache and asked to be excused.
   亨利肚子疼请求离开一下。
6. He appealed to his friends for support.
   他请求朋友支持。