after-image的翻译，读音
释义：
[计] 更新后图象, 改后录象
[医] 后象
n. The impression of a vivid sensation retained by the
retina of the eye after the cause has been removed; also extended to
impressions left of tones, smells, etc.
[医] 后象
n. The impression of a vivid sensation retained by the
retina of the eye after the cause has been removed; also extended to
impressions left of tones, smells, etc.