Using the linear programming method, they have set up a mathematic optimization model for adjusting age-grade of timber forest in Hushan Forestry Farm of Suichang, Zhejiang.

用线性规划的方法建立遂昌湖山林场用材林龄级调整最优化数学模型。

youdao

3rd grade (age 8).

三年级(8岁)。

youdao

Are you really in Grade One? Can you tell me your age?

你真的在一年级吗？你能告诉我你多大了吗？

youdao

''In Ireland we see an urgent need for an age-grade performance manager.

BBC: SPORT | Rugby Union | Irish | New role for Kidney

But Mitchell made steady progress through Welsh rugby's international age-grade sides before making appearances from the bench on that north America tour against Canada and the United States.

BBC: Wales prop Craig Mitchell to join Ospreys' exodus

Rees has played against most of the Ireland XV in the Magners League, while in opposite number Tomas O'Leary he has an opponent he has been playing against since age-grade rugby.

BBC: Richie Rees eager to repay Wales faith against Ireland