金刚砂
[jīn gāng shā]
Definition:
AllAll,emeryemery,corundumcorundum,silicon carbidesilicon carbide,carborundumcarborundum,SiCSiC,powder emerypowder emery
More sentence filters
Hide sentence filters

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Minnesota Mining & Manufacturing Co. was formed in 1902 to mine corundum. Then it diversified into making sandpaper.