bulls and bears meaning in English

买空卖空

Men used to bait bulls and bears for sport
从前人们常逗弄牛和熊取乐。
A dual option position involving a bull and bear spread with identical expiry dates
一种期权策略，这种策略可以借具有相同有效期的看跌期权或者看涨期权得以贯彻。
Sometimes he stays all winter in florida , hunting and fishing ; then goes over to hot springs , arkansas , takes a course of baths ; returns to wall street in good health and fit for another tilt with the bulls and bears
有时他会在佛罗里达呆上一整个冬天，打猎钓鱼，然后转道去体会一下阿肯色洲炎热的早春，舒服的享受一系列洗澡沐浴的乐趣，再身强力壮的返回华尔街，有能力应付任何牛市和熊市的挑战。
This methods is based on that when there is herding in stock market csad is going to become smaller . the results is when the markets dropping there is herding among investors , when the markets rising , there is no evidence of herding . the results prove my reasoning in section 3 . why there is difference between bull and bear markets is due to investors " different attitudes towards loss and gains
通过对个股收益率分散程度指标横截面绝对偏离度( cross - sectionalabsolutedeviation , csad )和市场收益率之间的关系模型的回归统计分析，本文发现：在市场行情上升的时候，市场中的羊群行为并不明显；在市场行情下跌的时候，市场中存在明显的羊群行为。