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。

youdao

Rogers has had an unlocking policy in place for awhile, but it isn't what most would call reasonable: an unlock isn't even an option until the contract is over, which could involve a 3-year wait and obsolete hardware that isn't worth the effort.

ENGADGET