慢速英语:Mucus: Your Friend Against Bacteria

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短语讲解：

1. Because of the mucus flowing and dripping from your nose.

because of 因为，由于
例句：John's jacket got out of shape because of the heavy rain.
约翰的夹克因为大雨而变形。

2. He says this virus, when mixed with mucus cells in the body, can help protect it against bacteria.

mix with （使） 与…混[结]合; 与（某人）交往
例句：He doesn't mix with the rabble here.
他不与这里的下等人交往。