健康的饮食对于消化系统的正常运作至关重要。

A healthy diet is essential for the proper functioning of the digestive ___system.

规律锻炼有助于增强你的免疫系统。

Regular exercise can help to strengthen your immune ___system.

神经系统负责向全身发送信号。

The nervous ___system is responsible for sending signals throughout the body.