Derustit
电化学除锈法
🗣️ 情景例句
Gemma, sit. Gemma
Gemma,坐,Gemma,
He who does not advance falls backward.
不进则退。
She finished it at half past nine. She went to bed before a quarter to ten.
30 她完成了作业。她9：45之前上床睡觉。