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on the latch 仅上门闩的，关着的，未上锁的
off the latch 未上门闩的，虚掩的
2）v. 用门闩栓牢或用撞锁锁住
你离开的时候别忘了把前门锁上。
Don’t forget to latch the front door when you leave.
an expert economist 一个老练的经济学家
an expert thief 一个熟练的贼
be expert at sth/ doing sth
be expert in sth/ doing sth
她对付孩子非常擅长。
She is expert at handling children.
She is expert in handling children.
★develop v. 养成 develop a habit
① vt. &vi. 发展，扩展
The village has developed into a town now.
developing country 发展中国家 ；
developed country 发达国家
V-ed 强调已经，V-ing 强调正在，有时态的区别
boiling water 滚开水 ； boiled water 开水
②develop the film 冲洗胶卷
