Interval integral
[计] 区间积分
🧩 词语组成解析
🗣️ 情景例句
He is liked very much because of his courtesy.
他由于彬彬有礼而颇获好感。
He has gone to America.
他去了美国。[表示结果持续至今]
Jim, how long have you been at this school?
吉姆，你到这学校有多么时间了？