Definite integral
[计] 定积分
🧩 词语组成解析
🗣️ 情景例句
if it's all right with your dad.
假如你爸爸答应的话。
Why did't you tell me?
为什么你不告诉我？
Gandhi was thrown off a train and later a mail bus for insisting on travelling in the whites-only section.
旅行时，甘地因为坚持要坐白人座位，曾经先后两次被从一列火车与一辆邮车里扔出来。