Permag
清洁金属用粉
🗣️ 情景例句
Exploring outer space is a challenge to mankind.
探索外层空间是一项向人类发出的挑战。
Count not your chickens before they are hatched.
不要过早乐观。
A young man and a young woman were sitting behind me.
一青年男子与一青年女子坐在我的身后，