化学物质的蒸发对它们的生存是必不可少的。
The evaporation of chemicals is necessary for their survival.
磷对人体中健康的皮肤，头发和神经必不可少。
至于巴勒斯坦人的团结，这实际上对任何切实可行的解决方案都是必不可少的。
As for Palestinian unity, it is indeed essential for any viable settlement.
性别平等对实现增进健康是必不可少的。
Gender equality is essential to the achievement of better health.
日光和新鲜空气对身体健康是同样必不可少的。
Sunlight is no less necessary than fresh air to a healthy body.
备份：对任何用到电脑，存储数据的人来说，备份是必不可少的。
Backups: Are essential for anybody who USES a computer and stores data.
当然解除对市场的管制必不可少。
因此，一定量的愤怒，对我们的生存是必不可少的。
A certain amount of anger, therefore, is necessary to our survival.
空气对人来说是必不可少的，对植物来说也一样。
Air is necessary for people, it is necessary for plants as well.
食物和水对我们来说是必不可少的。
那么在日常用车生活中，我们对发动机的清洁工作也是必不可少的。
So in the daily work life, we clean the engine is also essential.
精通至少一门外语越来越对我们是必不可少的技能。
A good command of at least one foreign language has increasingly been an essential skill for us.
放松对恢复来说必不可少。
了解和研究休闲，对相应群体的休闲教育是必不可少的。
To know and research leisure, there should be the leisure education for the certain group.
空气对动物来说是必不可少的。
蛋白对细胞的生物活性和健康是必不可少的。
Proteins are essential for all biological activities and the health of the cell.
若要更好地理解这种独特的风格，对其语言的分析必不可少。
To understand him, the analysis of his language techniques is very important.
对许多人来说，上班和上学是生活中必不可少的一部分。
这一点很难(大概对每个人来说都一样)，可是对我来说必不可少。
This is a difficult one (and probably is for everyone), but it's essential for me.
而礼貌和智慧对双方都必不可少。
我想，对任何想要过灵修生活的人来说，独处是必不可少的。
I think for anyone who wants to live a spiritual life, solitude is essential.
空气对一切生物都是必不可少的。
睡眠对健康是必不可少的。
有效的文献搜索对循证医学的实践是必不可少的。
Efficient literature search is essential to the practice of Evidence-Based Medicine.
对现代社会，这两个是必不可少的。
日光和新鲜空气对身体健康是同样必不可少的。
Sunlight tis no less necessary than fresh air to a healthy body.
日光和新鲜空气对身体健康是同样必不可少的。
Sunlight tis no less necessary than fresh air to a healthy body.
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