在牛市价差中使用较低的两个执行价格，在熊市价差中使用较高的执行价格。
The lower two strike prices are used in the bull spread, and the higher strike price in the bear spread.
在牛市中寻找财富在熊市中保持防御姿态。
Make a fortune in a bull market play defensive in a bear market.
在熊市里，一旦突然全场士气低落，你最好赶快平仓。
In a bear market, it is always wise to cover if complete demoralization suddenly develops.
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