A coarser grade of iron will lower the yield of ferrocene.
粗粒的铁将降低二茂铁的产量。
Airmail paper: Light-weight, high grade writing papers invariably made from rag for strength. One of the common usages is for aerogramme.
空邮纸:轻身高级书写用纸，多用破布造成，质地结实。常用作航空邮柬。
These are first grade apples.
这些是一等苹果。
※The brotherly spirit of science , which unites into one family all its votaries of whatever grade ,and however widely dispersed throughout the different quarters of the globe.——Franklin Rosevelt, American president 科学的博爱精神把分散在世界各地、各种热心科学的人联结成一个大家庭。美国总统 罗斯。.F.
