| 单词 | -er | 
| 释义 | -er1 suffix-er2 suffix-er-er1 /ə $ ər/ suffix    forms the comparative of many short adjectives and adverbs:  hot, hotter  dry, drier  fast, faster → -est -er1 suffix-er2 suffix-er-er2 suffix [in nouns]    1someone who does something or is doing something:  a dancer  a driver2something that does something:  a scraper  (=a tool you use for scraping) → -ar, -or | 
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