Air pollution in the city had reached four times the acceptable levels.

这座城市的空气污染程度曾高达可接受标准的四。

The synthesis of fluorine substituted saponite was explored and suceeded under mild temperature hydrothermally.Microwave-hydrothermal synthesis of sapontie was performed first time.

层状材料的微波水热快速合成研究也进行了首次探索，发现可以在可接受的合成条件下得到具有三八面体结构的皂石。

Please note that it is perfectly acceptable to have a Pembroke Welsh Corgi that is black and tan with no white, but a Pembroke Welsh Corgi that is black and white with no tan present is a mismark.

请注意它可接受的完美的PWC,它有黑和褐无白，PWC这又黑和白无褐错误的标记。