单词：arithmetic progression
[经] 算术级数, 等差级数
arithmetic progression的用法和样例：
例句
- "A science fiction cannot not be regarded as a mere entertainment, but in fact it tells the reader much more.""科幻小说不能简单地看成是供消遣的，而实际上它给读者展示更深刻的内容。"
- Subsistence only increases in an arithmetic ratio.生活资料只能按算术级数增长。
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