期权到期日Expiration Date：到期日即是指期权合约所规定的，期权购买者可以实际执行该期权的最后日期。
投资人在同一时间买进和卖出同一类期权，此两个期权到期日相同，但执行价格不同。
It is a kind of option strategy that the investor buy and sell the same type of two options which have the same expiry date but with the different strike price.
看涨期权赋予买方以权利，但不必负有义务，在期权到期日当天或到期之前，按敲定价格买进相关期货合约。
A call is option that gives the buyer the right, but not the obligation, to purchase the underlying futures contract at the strike price on or before the expiration date.
看跌期权赋予买方以权利，但不必负有义务，在期权到期日当天或者到期之前，按照敲定的价格卖出相关期货合约。
A put is an option that gives the buyer the right, but not the obligation, to sell the underlying futures contract at the strike price on or before the expiration date.
应用推荐