call on / upon sb / sth 1. to formally ask someone to do something呼吁,号召:call on sb to do sth•The UN has called on both sides to observe the ceasefire.联合国已呼吁双方遵守停火协议。2. to visit someone for a short time短暂访问:•Why don't you call on my sister when you're in Brighton?你到了布赖顿何不去看看我姐姐呢? |