calling的原型

原型是call，例如：

1、He didn't even have the intelligence to call for an ambulance.他连呼叫救护车的头脑都没有。

2、The constable received a distress call， and saw two youths attacking his colleague.这名警察收到了求救呼叫，看见两个年轻人正在殴打他的同事。