英语语法分析

But nonpathogenic Saccharomyces cerevisiae couldn't produce biofilm.

非致病的酿酒酵母不能形成生物膜。

Wild waterfowl are the natural reservoir of all influenza a viruses, and these viruses are usually nonpathogenic in these birds.

野生水鸟是所有甲型流感病毒的自然储存宿主，通常这些病毒对它们不具有致病性。

The invention relates to an application of nonpathogenic edwarsiella tarda, belonging to the fields of immunology and microbiology.

本发明涉及免疫学和微生物学领域，具体的说是一种非致病性迟缓爱德华氏菌的应用。