1、constant
持续不断的;重复的;一直存在的
She suggests that women are under constant pressure to be abnormally thin.
她暗示说女性总是处在保持身材异常瘦削的压力之下。
Inflation is a constant threat.
通货膨胀始终是个威胁。
恒定物;常数；常量；常项
In the world of fashion it sometimes seems that the only constant is ceaseless change.
在时装界，有时似乎唯一永恒不变的东西就是不断的变化。
Two significant constants have been found in a number of research studies.
若干研究已经发现了两个重要常量。
2、contribute
(为…)做贡献
The three sons also contribute to the family business.
这3个儿子也为家族事业做出了贡献。
I believe that each of us can contribute to the future of the world.
我相信我们每一个人都能够对世界的未来有所贡献。
捐献;捐助;援助
The US is contributing $4 billion in loans, credits and grants.
美国将提供40亿美元的信贷和赠款。
They say they would like to contribute more to charity, but money is tight this year.
他们说他们很想捐献更多的钱支持慈善事业，但是今年的钱非常紧张。
促成;促使；是导致…的原因之一
The report says design faults in both the vessels contributed to the tragedy.
报告说两艘船存在的设计缺陷也促成了这场悲剧的发生。
Stress, both human and mechanical, may also be a contributing factor.
来自人的和机械方面的压力可能也是一个因素。