61、learn/know sth by heart 背诵，牢记在心

62、help oneself to sth/cannot help doing sth/cannot help to do sth 随意吃/忍不住做某事/不能帮助做某事

63、hold on/hold up 坚持，稍等/堵塞

64、insist on/persist in/stick to 坚持

65、knock at the door/knock into the wall/knock out sb/knock sth off/knock sth over 敲门/撞墙/打晕或人/把……打掉/把……撞倒

eg：Who has knocked the vase off the shelf?谁把花瓶从架子上弄掉的?

66、let out the secret/keep sth a secret 泄密/保存隐秘

67、before long/long before/it is not long before …好久之前/不久以后/不久以后便……

eg：It was not long before I realized that how foolish I was at that time.不久以后我便认识到我其时是多么的愚笨。

68、be made up of/consist of/contain/include 由……构成/包含，包含

eg：The class is made up of fifty students./The class consists of fifty students./The class contains/includes fifty students.这个班由五十名学生构成。

69、mean to do sth/mean doing sth 计划做某事/意味着做某事

eg：I didn't mean to hurt you by telling you the truth.我通知你本相并不是计划要损伤你。

eg：It means killing me that you lie to me.对我说谎就意味着要杀了我。

70、in badly need of/in lack of/in want of 急需，缺少