contribute v．是……的原因之一；促成，造成；捐献，捐赠；增加，添加；贡献；投稿
(教材P48) Noise pollution and light pollution in big cities may also contribute to sleep problems.
大城市的噪音污染和光污染也可能导致睡眠问题。
[例] Pollution from nearby factories has also contributed to the problem.
来自附近工厂的污染也是造成这一问题的原因。
[归纳拓展]
(1)contribute...to... 把……贡献给……；
给……投/撰稿；把……捐赠给……
contribute to 有助于；促成，起作用
(2)contribution n. 贡献；捐款
make a contribution/contributions to
对……做出贡献
