Interval number
[计] 区间数
🧩 词语组成解析
🗣️ 情景例句
Fifty years? Wow!
五十年？ 喔！
He is a man of his word.
他是守信的人。
Only the Earth provides ideal conditions, and even here it has taken more than four billion years for plant and animal life to evolve.
只有地球提供理想的条件，而即使在这里，植物和动物的进化也用了40亿年的时间。