Options
字面意思是可选择权，从金融角度看是一个专有名词，意味着期权，下面是两种期权的定义。
• A call option (看涨期权) gives the holder the right to buy an asset by a certain date for a certain price (the strike price)
• A put option (看跌期权) gives the holder the right to sell an asset by a certain date for a certain price (the strike price)
