Ultrafines
超细粉末
🗣️ 情景例句
Sure. Where are you going?
当然。您要去哪里？
I think you may have something there.
我认为在那方面你可能是有理的。
Oil rigs have to be repaired frequently and divers,who often have to work in darkness a hundred feet under water,
钻井平台需要经常修理，潜水员常常要在水面100英尺以下摸黑工作，