Adding middle grade sintered magnesia powder can enlarge the line ratio and porosity after high temperature treatment.

中档镁砂粉的添加使浇注料高温处理后的线变化率增大和气孔率增加。

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Conclusion: KMSHT capsule had low middle grade of genetic toxicity and general reproductive toxicity, but no embryo toxicity.

结论：昆明山海棠胶囊具有低-中度的遗传毒性和一般生殖毒性，而无胚胎毒性。

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Lower reading achievement scores and grades in fifth grade contributed to reduced grades in middle school and thereby contributed to a 40% lower high school graduation rate.

五年级学生的阅读成绩分数较低，导致其进入中学后成绩下降，进而导致高中毕业率下降40%。

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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