他有一种需要改变的不健康生活方式。

He has an ___unhealthy lifestyle that needs to change.

生活在这样污染严重的环境中是非常不健康的。

Living in such a polluted environment is very ___unhealthy.

高糖饮食对你的牙齿不健康。

A diet high in sugar is ___unhealthy for your teeth.