■ contribute 与 contribution

无论是动词或名词，意义都不一定限于正面的“贡献”，也可以表示负面的“助长作用”。

• air travel's contribution to global warming航空交通对全球变暖起的影响
• Soaring land prices contribute to the high cost of housing.地价飞涨，使得建房成本很高。
• His carelessness contributed to the accident.他的粗心大意，也是造成事故的一个原因。
• Smoking is a major factor contributing to lung cancer.吸烟是引起肺癌的一个主要因素。

• guest
• guest
• guy
• habit
• habitable
• habit 与 custom
• had
• had better
• had + pp
• had pp
• had to
• hair
• half
• hand
• hang
• happen to
• hard
• hardly
• hard-pressed
• hare
• has it that
• hatred
• have
• have a heart
• have got