Bibliometer
吸水性能测定仪
🗣️ 情景例句
You're the only one
你是我们当中唯一
What are you writing?
你正在写什么？
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come back.
大家都知道，在墙壁或山腰附近发出的喊声，就会听到回声。