call option
购买选择权
例句与用法：
OK if I call on you tomorrow?
我明天来找你行吗?
All you have to do is call on the house phone.
我只要做的就是拨个室内电话。
I'm going to call on one of my former classmates.
我要去看望我的一位老同学。
If I were free now, I might call on him.
如果我有时间，我可能会去看他。
I'd like to call on you this Sunday.
我想这个星期天来找你。
Tomorrow I'll pay a call on him.
明天我将要去拜访他。
The government calls on the youth to donate their blood voluntarily.
政府号召青年义务献血。
Our salesmen call on their best account twice a month.
我们的销售人员每月访问最好的客户两次。
ph.
【商】看涨期权