分子键: molecular bindingmolecular bondmolecular linkagemolecularbondvan der waals bond
断: Ⅰ动词1.(分成段) break; snap 短语和例子棍子断成两段。 the stick broke in two. 绳子断了。the string broke.树枝在积雪的重压下突然断了。the branch snapped under all that snow.2.(断绝;隔断) break off; cut off; stop 短语和例子断敌退路 cut off
