call在这里指的是看涨的意思，与之相对应的是put，看跌。

“short call”卖出看涨期权，是指卖出者获得权利金，若买入看涨期权者执行合约，卖出方必须以特定价格向期权买入方卖出一定数量的某种特定商品。看涨期权卖出方往往预期市场价格将下跌。A short call is a strategy involving a call option, which obligates the call seller to sell a security to the call buyer at the strike price if the call is exercised. It is a bearish trading strategy, reflecting a bet that the security underlying the option will fall in price.

如果套期保值者预计相关商品的价格有可能小幅下跌，并预计不会出现大幅度上涨时，通过卖出看涨期权可以获得权利金收益，从而为现货交易起到保值的作用。当然，如果商品价格大幅度上涨，期货价格涨至看涨期权的执行价格以上时，套保者可能会面临期权买方要求履约的风险，这会给交易者带来较大损失，因此进行这种保值的操作需要谨慎。

“long call”买入看涨期权，是指购买者支付权利金，获得以特定价格向期权出售者买入一定数量的某种特定商品的权利。当投资者预期某种特定商品市场价格上涨时，他可以支付一定的权利金买入看涨期权。A long call gives you the right to buy the underlying stock at strike price A. Calls may be used as an alternative to buying stock outright. You can profit if the stock rises, without taking on all of the downside risk that would result from owning the stock. It is also possible to gain leverage over a greater number of shares than you could afford to buy outright because calls are always less expensive than the stock itself.

交易者可以买入与之相关的期货合约的看涨期权，一旦商品或资产价格上涨，可以履行看涨期权，以较低的执行价格买入期货合约。然后按上涨的价位高价卖出期货合约获利，在弥补所支付的权利金后还有盈余，这部分盈余可以弥补因价格上涨高价购进商品所带来的亏损；也可以直接将期权高价卖出，获得权利金收益，这均可起到保值的作用。如果商品或资产价格没有上涨而是下跌了，交易者可以放弃履行期权，这只会带来很少的权利金的损失，该损失可以由低价购进商品或资产的收益所弥补。

以下为相关双语示例，供参考：

Also, a combination of a long futures contract and a short call, called a synthetic short put.

同时，买进期货合同和卖出看涨期权的组合，叫做组合卖出看跌期权。

Long calls offer a significant growth potential and investors realize gains when the market price rises above the strike price, i.e. the price that the option is exercised.

买入看涨期权可以带来巨大的增值机会，市场价格高于执行价格（即行使期权的价格）时，投资者就可以实现收益。