Spectrodensitometer
光密度计
🗣️ 情景例句
Do I have to remind you yet again?
还需要我再次提醒你吗？
How did you decide that product was safe?
你怎样决定产品是安全的呢？
Hello. You must be Dr Yang. How do you do? My name's David Lee.
嗨。你一定是杨博士吧。您好！我是大卫·李。