Bibliometer
吸水性能测定仪
🗣️ 情景例句
How many stamps do I need?
我需要多少邮票？
I'm playing with the dog downstairs.
我在楼下和狗玩。
I don't know whether you realize it, but this condition is essential to us.
我不知道你是否了解，但是，这个条件对我们是必要的。