前庭大腺脓肿系因病原体侵犯前庭大腺腺管,导致前庭大腺导管炎,腺管开口因肿胀或渗出物凝聚而阻塞,脓液不能外流积存。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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