harmful bacteria短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 有害的细菌 Millions of potentially harmful bacteria are present in the body, but without the proper chemical signals, such as from a hormone, they simply pass through the digestive tract. 体内存在着无数的潜在的至病菌，但是如果没有正确的化学信号，例如激素，它们只是简单的从消化道经过。 essaystar