4H
词形变化
4Hs
复数
4Hs
释义与例句
n.
-
1.
A grade of pencil with lead that makes lighter marks than a pencil grade 3H but darker marks than a pencil of grade 5H; a pencil with very hard lead.
不可数 英国 -
2.
A pencil of grade 4H.
不可数