胃泡鼓音区(Traube区),位于左前胸下部肋缘以上,约呈半圆形,为胃底穹隆含气所致,下列哪一种情况不会使此区缩小或消失( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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