Is sadness something we can live without or is it a crucial part of the human condition?

悲伤到底是我们生活中不必要的东西，还是人类生存的关键条件？

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Instead, sadness is simply part of nature.

与之相反，悲伤简直就是大自然的一部分。

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They fear that the increasing tendency to treat normal sadness as if it were a disease is playing fast and loose with a crucial part of our biology.

研究者担忧，这种逐渐兴起的、将普通的悲伤情绪当作疾病来治疗的趋势，会加速我们的生物有机体的运行，并使之瓦解。他们认为，悲伤是具有进化论意义的。

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Mr Mallon said there could be some sadness around saying goodbye to the Northern Bank name, which has been part of the fabric of life in Northern Ireland for more than 200 years.

BBC: Northern Bank officially rebrands as 'Danske Bank'