Concentration gradiant
[电] 浓度梯度
🧩 词语组成解析
🗣️ 情景例句
And I'll need to see your passport.
另外，我需要看一下您的护照。
Why aren't you happy?
为什么无聊呢？
People tend to amass possessions, sometimes without being aware of doing so.
人们喜欢收藏东西，有时并没有意识到自己在这样做。