Volume integral
[计] 体积积分
🧩 词语组成解析
🗣️ 情景例句
Hello, sir.
您好，先生。
When the weather is hot, we turn on the air conditioner.
天热的时候就开空调。
He did not know from which part of Africa his ancestor had come.
他不知道祖先来自非洲的什么地方。