这些都是 App 里的真实音频，请打开声音。
Hear both words in 10 voices
Each row is one speaker saying both words. Play one, then the other, and switch to slow when the difference hides.
- American woman, younger
- American woman, older
- American man, younger
- American man, older
- British woman, younger
- British woman, older
- British man, younger
- British man, older
- Australian woman
- Australian man
What's different
After the k, the two words are identical: the vowel glides from "ah" to "oo" and ends on d. So the whole difference is packed into the moment between the k and the vowel, while air from the k is still escaping.
In crowd, that moment sounds like a quick w: the lips round, and the vowel starts darker and lower. In cloud, the k opens straight into a light l, and the vowel starts bright. If you can't hear it at normal speed, the slow takes stretch the l and r enough to notice.
研究： Logan et al. 1991 · Lively et al. 1993 · Lively et al. 1994 · Bradlow et al. 1997 · Bradlow et al. 1999
R 的声音更暗、更圆，L 听起来更轻、更清楚。
More word pairs with these sounds
听辨 L 和 R: all 42 pairs →现在就开始，听出差别。
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