Metalsorter
金属鉴别仪
🗣️ 情景例句
Sure. Come on.
当然记得。你来吧。
She is free any time you need help.
你需要帮忙时，请随时向她求助好了。
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。