在孩子小时候，这些细菌让免疫系统得到了锻炼，增强了自身的免疫能力，使得他们长大后能够抵抗过敏的侵袭。

Exposing young children to these bacteria helps "exercise" their immune systems early in life so that they're better able to resist allergic diseases later.

youdao

在孩子小时候，这些细菌让免疫系统得到了锻炼，增强了自身的免疫能力，使得他们长大后能够抵抗过敏的侵袭。

Exposing young children to these bacteria helps "exercise" their immune systems early in life so that they're better able to resist allergic diseases later.

youdao