adj. 高兴的，快乐的；疲倦的，累的
v. （马、骡等）突然弓背跃起把（人或物）摔下；强行通过（buck 的过去式）
1.When the dollar bucked up at the end of 1980, gold prices retreated.
1980年底美元逆势增长，金价开始回跌。
2.The morning fresh air bucked him up.
早晨的新鲜空气使他精神抖擞。
3.The horse twisted and bucked and finally dismounted its rider.
那匹马扭动并猛然弓背跃起，使得骑手摔下马。
4.It is the second time that the firm has bucked the recent trend of partners leaving Australia's largest firms.
这是律所第二次打破合伙人不断离开澳大利亚大型律所的趋势。
5.When he tried to ride the horse, it bucked wildly.
当他试图骑上这匹马时，它突然狂暴地跃了起来。
6.The horse bucked the rider off .
马跃起将骑手摔于马下。