单词：normal flora
normal flora的用法和样例：
例句
- Antibiotics produce a selective change in flora.抗菌素引起菌丛的选择性变化。
- Nystain has been found to inhibit the growth of yeast like flora in the intestinal tract.已查明制霉菌素在肠道内可抑制菌丛类酵母菌的生长。
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