Arithmetic series
等差级数
🧩 词语组成解析
🗣️ 情景例句
We might need you to come through with your friends, Robbie.
我们也许需要你们多邀朋友来帮忙， Robbie。
We waved until the car was out of sight.
我们挥手直到汽车消失。
When the bull got close to him, he clumsily stepped aside to let it pass.
观众欢呼起来，醉汉向人们鞠躬致谢。