62. help oneself to sth / cannot help doing sth / cannot help to do sth 随便吃/ 禁不住做某事/ 不能帮忙做某事 63. hold on / hold up 坚持,稍等/ 阻塞 64. insist on / persist in / stick to 坚持 65. knock at the door / knock into the wall / knock out sb...
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