男性,60岁。因左侧胸痛、气急进行性加重3周就诊。B超检查发现左侧大量胸腔积液。胸片示除左肺尖可见外,左侧胸腔大片均匀一致的浓密阴影,肋膈角消失。气管和纵隔无移位。关于后者其重要性在于()
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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