Low and middle grade diatomite purification is of great importance in its industrial use development.

中低品位硅藻土提纯在其工业应用开发中有着重要意义。

youdao

We are the enterprise specializing in producing and selling top and middle grade commodity ceram-ics.

本厂是一家专业生产、销售高中档日用陶瓷的企业。

youdao

In our country, office space market is usually compartmentalized into top grade, middle grade and low grade.

就我国的办公楼市场而言，一般分为高档物业、中档物业、低档物业。

youdao

There is a significant shortfall in the number of middle grade, more experienced doctors.

BBC: Doctor 'danger weeks' spark casualty warning

Mr McGoran said it had been successful in recruiting consultants but that attracting middle grade, more junior doctors was a problem.

BBC: Trust attacked on GP recruitment at Downe Hospital

My kids have entered that nebulous no-mans-zone known as the middle grade (or tween) years: too old for simple chapter books (like The Magic Tree House series), but too young to demolish YA books about vampires by the dozen.

FORBES: Not Ready for Vampires? Laurel Snyder Writes Great Books for Tweens