长期压力会对人的免疫系统产生有害影响。

Chronic stress can have a detrimental effect on a person's immune ___system.

富含纤维的饮食对你的消化系统有益。

A diet rich in fiber is beneficial for your digestive ___system.

中枢神经系统可以说是人体最复杂的部分。

The central nervous ___system is arguably the most complex part of the human body.