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。

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What is a lower bound for the price of a four-month call option on a non-dividend-paying stock when the stock price is $28, the strike price is $25, and the risk-free interest rate is 8% per annum?

什么是一个较低的一个非，股息，支付的股票四个月呼叫选项的价格势必当股票的价格是$ 28，行使价$ 25，无风险利率每年8％？

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An Apache pilot will be hard pressed to make the right call on whether to strike a convoy that could contain the oppressor or the oppressed.

CNN: IT'S FLIGHT OR FIGHT

But its executive has refused to follow a call from its annual conference to ballot for a one-day strike on the issue.

BBC: Teachers' pay 'a monster'

"Broadcast television needs a jolt, " Reilly's boss and Fox Entertainment Chairman Peter Liguori said of the post-strike network viewer malaise on a call with reporters today.

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