n.屁股，流浪乞丐，无业游民，懒汉，游手好闲者
vt.提出要，乞讨，使不安，使灰心
adj.劣质的，错误的，没用的

原形：bum第三人称单数：bums复数：bums过去式：bummed过去分词：bummed现在分词：bumming

He was feeling pretty low after his breakup, but he decided to bounce back with some exercise.
他分手后情绪很低落，但他决定通过锻炼振作起来。
The ball bounced off the wall and landed at my feet.
球弹跳到墙上然后落在了我的脚边。
She took a few bounces on the trampoline before she could stop herself.
她在蹦床上跳了几下才停下来。
The basketball player's bum showed how out of shape he had become.
篮球运动员的大腿肌肉松弛，显示出了他的体形已经走样了。
The toddler was having a great time bouncing around on his new trampoline.
幼儿在新买的蹦床上跳来跳去，玩得很开心。
The dog happily chased its tail, giving itself a good bounce.
狗高兴地追着自己的尾巴，给自己来了个跳跃。
She gave her bum a pat as she admired her new dress in the mirror.
她对着镜子拍拍自己的臀部，欣赏着新裙子。
After a long day at work, he collapsed onto his bed with a satisfying bounce.
在一天的工作之后，他满意地在床上弹了一下，然后倒下。
The little boy's bum was sore from sitting on the hard wooden bench all day.
小男孩坐在硬木凳上一整天，屁股疼得厉害。
The rubber ball absorbed the impact when it hit the ground, giving a soft bounce.
当橡胶球落地时，它吸收了冲击力，反弹得很轻柔。