grade a nickel的意思|示意

The invention relates to the field of metal metallurgy, in particular to a method for segmented acid-adding and circulating leaching of coarse particles in low-grade nickel oxide ores.

本发明涉及金属冶金领域，特别是指一种对于低品位类氧化镍矿中的粗粒分段加酸循环浸出的方法。

When I went to grade school (some years ago), a candy bar still cost a nickel. Gasoline sold for 27 cents a gallon. And my dad bought a new 1961 Ford Fairlane for about $3,000.

当我还在上中学的时候（许久以前），一条糖果棒只卖五分、一加仑汽油只卖27分，而父亲大约只花3，000美元，便购入一辆一九六一年的新型福特房车。