He kept bouncing up and down like a yo-yo .他像个悠悠球似的蹦蹦跳跳。Don't talk to him, he is a real yo - yo.不要跟他说话, 他真是个摇摆不定的呆瓜.My emotions went up and down scale a yo - yo.当时我的情绪就好象悠悠轮一样忽上忽下....
These camp robbers hae become habituated to campers as a food source.这些营地掠夺者已经惯于将野营者作为一种食物来源.In my opinion you won't go, you're habituated to luxury.我劝你还是别去, 你过惯了奢华的日子,受不了那份苦....