Photolometer
光电比色计
🗣️ 情景例句
This is very helpful, Mrs. Martinelli.
这样很有用， Martinelli太太。
Send a postcard to me when you arrive in Shanghai.
你到上海以后给我发张明信片。
he identifies himself with its centre of gravity, its mass, its weight;
他把自身和物体重心、质量、重量融为一体。