The concept of the differential and cut-off grade is pointed out, and its mathematical model is built as well.

提出了级差边际品位的概念，建立了级差边际品位的数学模型。

youdao

They are respectively named cut-off grade, marginal grade, economic grade and the average grade of an ore deposit.

这4项品位指标依次为边界品位、边际品位、经济品位和矿床平均品位。

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Cut-off grade method has been used to control the ore drawing in non-pillar sublevel caving mining both in and outside China.

采用无底柱分段崩落采矿法，国内外一直采用截止品位放矿法来控制出矿。

youdao

"What I have seen is a lot of kids really take off because they do have the one-on-one attention and they are up to grade level, if not beyond,as a result of having been in the program."

VOA: special.2010.07.16

So when you're pissed off about your grade, the person to take it up with... well, take it up with them.

所以如果你因为你的分数想要发脾气，你要找的人。,恩，你要找的人是他们。

耶鲁公开课 - 死亡课程节选

If you blow off discussion section, you're grade will suffer.

如果你们不在课堂讨论好好表现，你们的分数可能会遭殃。

耶鲁公开课 - 死亡课程节选

Investors would have been better off in investment grade corporate and emerging market debt.

FORBES: Can You Build A Politics-Proof Portfolio?

Then he's off to another grade school, 25 miles south and a world away, in suburban Matawan, N.

FORBES: Is Crazy Bones cool?

It has already said if the switch-off took place, the Grade II listed lighthouse would remain intact.

BBC: NEWS | UK | England | Cornwall | Lighthouse switch-off considered