检查外包装的截止日期，以保证白脱牛奶是新鲜的。

Check the expiration date on the package to ensure that the buttermilk is fresh.

youdao

检查外包装的截止日期，以保证白脱牛奶是新鲜的。

Check the expiration date on the package to ensure that the buttermilk is fresh.

youdao