22) six of one and half-a-dozen of the other 半斤八两;没什么区别
23) stick around 在附近逗留或等待
24) stick with 继续做，坚持
25) straighten out 扯平;结清
26) toss and turn (身体)翻来覆去(通常表示难以入睡)
27) turn one's back (在别人遇到困难时)不愿帮助
28) under the weather 身体不适，生病
29) bite off more than one can chew 贪多嚼不烂;心有余而力不足;不自量力;力不从心
30) break new ground 创新
