例句與造句

1. Tight scale is usually a problem encountered in forgings hardened from direct - fired gas furnaces having high - pressure burners
   用高壓爐頭直燃煤氣爐對鍛件進行淬火時，通常會出現(xiàn)鱗片問題。
2. It's difficult to find fire gas in a sentence. 用fire gas造句挺難的