很少量的这种菌群是很难清除的。 此外，它们与低流量水流一起作用，可能促进细菌增长。

And that, combined with the low water flow, is probably promoting the growth.

youdao

很少量的这种菌群是很难清除的。 此外，它们与低流量水流一起作用，可能促进细菌增长。

And that, combined with the low water flow, is probably promoting the growth.

youdao