[机] basic bessemer cast iron, basic bessemer pig iron
jiǎn xìng zhuàn lú zhù tiě ㄐㄧㄢˇ ㄒㄧㄥˋ ㄓㄨㄢˋ ㄌㄨˊ ㄓㄨˋ ㄊㄧㄝˇ