The inessential has become perfectly essential.

无用之物都变有用之才。

These changes may be inessential, but they are harmless.

这样的改变也许无关紧要，但却不会招惹麻烦。

The reason tragic events were seen as positive was that they presented the victim with very clear goals while reducing contradictory and inessential choices.

悲剧事件被视为积极的原因是，它们为受害者提供非常确的目标，同时减少矛盾和不重要的选择。

A sense of smell has long been regarded as something trivial and even inessential to humans (as opposed to other animals, such as dogs, who live by their noses).

长期以来，嗅觉一直被认为是人类微不足道的东西，甚至是无关紧要的东西(动物相反，比如狗，它们靠鼻子生活)。

I think this kind of thinking, the thinking that senior employment is inessential, is actually the seed of a major problem that could impact a lot of lives, especially the lives of people in developing countries.

我认为，这种想法，即认为老年人就业无关紧要，实际上是一个重大问题的根源，尤影响到发展中国家人民生活。