They complain about a range of different problem反馈回来各种各样的问题

complain about抱怨； 发牢骚

Consumers are encouraged to complain about faulty goods.

要鼓励消费者对劣质商品投诉。

Stop moaning; you really have nothing to complain about.

不要再抱怨了，实际上你是没有什么事可抱怨的。

You know they, they contribute to less strokes, for instance,你知道它们会减少中风的几率

contribute to是…的原因；有助于；为…作贡献

Does smoking contribute to lung cancer?

吸烟会导致肺癌吗?

Honesty and hard work contribute to success and happiness.

诚实加苦干有助于成功和幸福。

so how do you balance it out?你会怎么抉择呢

balance out抵消； 中和

My accounts balance out for the first time this year.

我的账今年第一次收支平衡。

The good and bad effects of any decision will usually balance out.

任何决策的效果往往利弊互见。