Call是指买权，put是指卖权，两种期权又分别对应了long和short的两种操作，即买入和卖出两种操作。 1、买入call（long call）:买入 看涨期权 买入call可以使投资者以固定费用获得到期前用预定价格. Long的所有形式如下： long意思为长时间，长久地，始终。 读音：英 [lɒŋ]，美 [lɑːŋ]。 释义： adj. 2、long to +v后面要跟上动词原形。long for后面要跟上动词原形：long for + sb/sth long for.
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How long 的用法一、how long的用法how long有以下两个主要意思：1.
表示多长时间，主要用来对一段时间 (如three days, four weeks 等)提问。如：a：how long did he stay here?
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