求翻译：本文通过了解了铬废水的处理方法，选择了生物处理法，虽然生物法有许多优点，但是也存在处理效果不稳定、菌种扩培难度大等问题。是什么意思？

By understanding the treatment of chromium wastewater, select biological treatment, although the biological method has many advantages, but there are to deal with the effects of unstable bacteria spread cultivation difficult issues such as

Through this article about the chrome waste water treatment methods, and the selection process, although there are a number of benefits biological law, however there are also processing results are not stable, and bacteria, such as difficulty-expansion.

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This article learn about chromium-containing waste water treatment method, select a biological treatment method, although the biological method has many advantages, but there are treatment effects spread instability, strain difficult problems, such as.

This article through had understood the chromium waste water processing method, has chosen the biological treatment law, although the biological law has many merits, but also has the processing effect not not stably, the mold mushroom spawn expands cultivates the difficulty in a big way and so on th