There is a tendency for this disease to run in families.

这种疾病易在家族里遗传。

《牛津词典》

There is some inherited tendency to develop type 1 diabetes, but it is only a tendency, and actually most people (90%) who develop this disease do not have close relatives with it.

1型糖尿病有些遗传倾向，但它只是一种倾向，实际上大多数得这个病的人(90%)近亲中并没有得糖尿病的。

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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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