Micropycnometer
微型比重瓶
🗣️ 情景例句
Your photo in it helped, too.
在报纸上的照片也有帮助。
Please sign a copy of our Sales Contract No.156 enclosed here in duplicate and return to us for our file.
请会签第156号销售合同一式两份中的一份，将它寄回我方存档。
How old are you?
你多大啦？