1. To cause ulceration of. 
   导致…的溃疡
2. Ulceration of the mouth and lips. 
   口唇溃疡，口疮口腔或嘴唇的溃疡
3. of or relating to or characterized by ulceration. 
   属于或关于溃疡的，或有溃疡特点的。
4. an ulceration (especially of the lips or living of the mouth). 
   一种溃疡特别是嘴唇或口。
5. A pressure-induced ulceration of the skin occurring in persons confined to bed for long periods of time. 
   褥疮因人常期卧床，皮肤受压而引起的溃疡

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