SCIENCE STUDY
Bacteria that help us stay healthy
对人体友好的益生菌。
Did you know that there are some bacteria in our bodies that help us? They are called probiotics (益生菌). These bacteria help us stay healthy.
- 对本期电子报订户、有效期内的VIP教师会员和本学期初三尊享卡用户，我们开放所有内容：
- 如果您拥有以上权限，请点这里登录；
- 订阅电子报，请点这里；
- 激活VIP教师卡，请点这里；
- 激活21英语尊享卡，请点这里。
