因为他发现这个已经流行已久的足浴盆如今在最高温度的设定、适用于何种人群、何种材料保证无害等方面都没有一个明确详细的行业规定。
Because he found that feet bath basin, which has been popular for a long time, still has no explicit and detailed industry regulations on the setting of the maximum temperature, suitable crowd, what materials are safe to use, etc.