This rich microbiota flourishing inside us may play a far greater role in the way exercise improves our health than previously thought. 在锻炼改善健康方面，我们体内丰富的微生物群发挥的作用可能比我们之前想象的要大得多。
结构分析：This rich microbiota flourishing inside us是主语（flourishing inside us是-ing式词组，作后置定语），may play是动词 词组，作谓语，a far greater role是名词 词组，作宾语，in the way exercise improves our health是介词 词组，作状语，than previously thought是介词词组，作比较状语（previously是副词 ，作状语）。
Jostling for space and food inside our gastrointestinal tract are about 100 trillion bacteria, viruses, fungi, and other single-celled organisms such as archaeo and protozoa. 大约100万亿个细菌、病毒、真菌和其他单细胞生物，如古细菌和原生动物在我们的胃肠道内争夺空间和食物。
结构分析：Jostling for space and food inside our gastrointestinal tract是-ing式词组，作主语（inside our gastrointestinal tract是介词词组，作地点状误），are是系动词 ，瑞在一般时，about 100 trillion bacteria, viruses, fungi, and other single-celled organisms such as archaeo and protozoa是介词词组，作表语（ such as archaeo and protozoa是介词词组，作状语）。
Their roles vary from helping to ferment dietary fibre from our meals, to synthesising vitamins and regulating our fat metabolism. 它们的作用各不相同，有的帮助发酵我们膳食中的膳食纤维，有的合成维生素，还有些能调节我们的脂肪代谢。
结构分析：Their roles是主语，vary是不及物动词，from helping to ferment dietary fibre from our meals, to synthesising vitamins and regulating our fat metabolism是介词词组，作状语。
They also help to protect us from unwanted invaders, interacting with our immune system and infllluencing the extent of inflammation in our guts and elsewhere in our bodies. 它们还保护我们的身体免受不必要的入侵，与我们的免疫系统互动，并影响我们肠道和身体其他地方的炎症程度。
结构分析：They是主语，also help是谓语，现在一般时，to protect us from unwanted invaders是动词不定式词组，作宾语, interacting with our immune system and infllluencing the extent of inflammation in our guts and elsewhere in our bodies是-ing式词组，作状语。
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