However, because of the indistinctness of its effective substances, the quality control has some problems.

但是，由于其药效物质基础不清楚，使质量控制上存在一定的问题。

youdao

However, because of the indistinctness of its effective substances, the quality control has some problems.

但是，由于其药效物质基础不清楚，使质量控制上存在一定的问题。

youdao