S.g.iron
[机] 球状石墨铸铁
🗣️ 情景例句
Yes, I went to the aerobics class today.
去了啦， 我上了有氧运动课了。
Last year, he applied to Harvard University for a scholarship and succeeded in passing a difficult examination.
去年，他向哈佛大学申请奖学金并通过了一个很难的考试。
Where can I go for help?
我该怎么办呢？