steel grade的用法和樣例：
例句
- The grade standards for tomatoes have been based on such a method.
番茄的等級標準的確定就是以這種方法為基礎。 - Our Tall Venice Boots are manufactured from premium grade sheepskin pelts.
我們的高的威尼斯靴子被由高級的等級毛皮制造成。 - The hypoeutectoid graphitized free cutting steel was proposed.
具有亞共析組織的鋼種其石墨化過(guò)程一直很難，因此該鋼種開(kāi)發(fā)的關(guān)鍵是促進(jìn)其石墨化過(guò)程。
