Retardation is a noun meaning delay, grade repetition, braking, or optical path difference (physics).
retardation: n. 指延迟、留级、制动或（物理）光程差。
| 单词 | retardation |
|---|---|
| 音标 | [ˌri:tɑ:'deɪʃn] [ˌritɑrˈdeʃən] |
| 释义 | n.["延迟","留级","制动","光程差"] |
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