求股东协议中call option条款的示例及译法？
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call option可以译为"看涨期权"或者"购买选择权"，与put option（“看跌期权”或“卖出选择权”）相对应。
看涨期权是指在协议规定的有效期内，协议持有人按规定的价格和数量购进股票的权利。期权购买者购进这种买进期权，是因为他对股票价格看涨，将来可获利。购进期权后，当股票市价高于协议价格加期权费用之和时，期权购买者可按协议规定的价格和数量购买股票，然后按市价出售，或转让买进期权，获取利润;当股票市价在协议价格加期权费用之和之间波动时，期权购买者将受一定损失;当股票市价低于协议价格时，期权购买者的期权费用将全部消失，并将放弃买进期权。
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补充一些例句：
The purpose of this circular is to provide you with further details regarding the Agreement, the Shareholder Loans, the Call Option and other information in accordance with the Listing Rules.
本通函旨在为阁下提供关于该协议、股东贷款、认购期权之进一步详情以及上市规则所规定之其他资料。
Property returns are modelled in a similar fashion to corporate bonds, namely as the return on a risk-free bond, plus a risk premium, plus a process representative of the change in residual values and the change in value of the call option on rents.
物业回报所用计算模型与公司债券类似，即无风险债券回报加风险溢价，再加代表剩余价值转变及租金选择权价值转变的算法。
For example, when you purchase a call option on an underlying stock, you are purchasing the right, but not the obligation, to buy a share of stock at a set cost or strike price.
例如，当购买标的股票的看涨期权时，所购买的是权力，而不是义务，以一个预定的价格来购买股票。
In contrast, negative correlations will reduce both the call option and put option values for the opposite reason due to the portfolio diversification effects of negatively correlated variables.
相反地，负的相关性会降低看涨和看跌期权的价值，因为负相关变量的资产分散功能所造成的相反原因。
另外，关于call option作为“看涨期权”来讲时，可参考如下示例：
Suppose that Microsoft stock is trading at $108 per share. You own 100 shares of the stock and want to generate an income above and beyond the stock's dividend. You also believe that shares are unlikely to rise above $115 per share over the next month.
You take a look at the call options for the following month and see that there's a 115 call trading at 37 cents per contract. So, you sell one call option and collect the $37 premium (37 cents x 100 shares), representing a roughly 4% annualized income.
If the stock rises above $115, the option buyer will exercise the option, and you will have to deliver the 100 shares of stock at $115 per share. You still generated a profit of $7 per share, but you will have missed out on any upside above $115. If the stock doesn't rise above $115, you keep the shares and the $37 in premium income.
参考译文：
假设 Microsoft 股票的交易价格为每股 108 美元。您拥有 100 股股票，并希望获得高于股票股息的收入。您还认为股价在下个月不太可能涨到每股 115 美元以上。
您查看下个月的看涨期权，发现有一个 115 看涨期权以每份合约 37 美分的价格进行交易。 因此，您卖出一个看涨期权并收取 37 美元的溢价（37 美分 x 100 股），相当于大约 4% 的年化收益。
如果股票涨到 115 美元以上，期权买方将行使期权，您将必须以每股 115 美元的价格交付 100 股股票。 您仍然产生了每股 7 美元的利润，但您将错过超过 115 美元的任何上涨空间。 如果股票没有涨到 115 美元以上，您将保留股票和 37 美元的溢价收入。
