Indefinite integral
[计] 不定积分
🧩 词语组成解析
🗣️ 情景例句
I could tell something was up by the look on their faces.
我一看他们的脸色就知道有事。
I have received a letter from my cousin.
我收到了我表兄的信。
I'm really positive that this product has all the features you have always wanted.
我确信这种产品有各种你所要的款式。