v. be lazy or idle
s. of very poor quality; flimsy
n. 游荡者, 懒鬼, 闹饮
a. 没有价值的
vi. 过游民生活, 乞讨, 流浪
vt. 乞讨
1. I hurt my bum when I fell off my bike.
我骑自行车摔倒时伤到了我的臀部。
2. He sat down on the grass and let his bum rest for a while.
他坐在草地上，让臀部休息了一会儿。
3. The little boy stumbled and landed right on his bum.
小男孩跌倒了，正好摔在了臀部上。