Simanal
西马纳尔硅锰铝铁合金
🗣️ 情景例句
Thank you. I appreciate your help.
谢谢！很感谢你的帮助。
Half the world knows not how the other half lives.
富人不知穷人苦。
Then knowledge began to be accumulated according to a systematic plan.
于是，知识便开始有系统有计划地积累起来。