Arithmetic series
等差级数
🧩 词语组成解析
🗣️ 情景例句
to schedule one hour a week--to start with.
安排一星期一个小时。
To put on make-up
打扮
He told me that the firm could not afford to pay such large salaries.
他还告诉我，公司支付不起这么庞大的工资开支，