And then there are the unlucky folks who have recurrent aphthous stomatitis or RAS, which basically means that they have extra painful canker sores that keep reappearing.
有些人更可怜，他们会患上RAS，即反复出现的更为严重的口腔溃疡。
| 单词 | aphthous |
| 释义 |
aphthous
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| 随便看 |
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