工作和烦恼是我们日常生活中不可或缺的元素。
Work and worry are indispensable elements of our daily lives.
如今的音乐节不只有明星和音乐，时尚也是不可或缺的元素。
Not only about stars and music, today's music festival is also about fashion.
必需微量元素在维持机体健康方面是不可或缺的。
Essential trace element is indispensable in maintaining body health.
必需微量元素在维持机体健康方面是不可或缺的。
Essential trace element is indispensable in maintaining body health.
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