轻烟动作(),尾端逐渐变宽变薄,随即分离消失。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
男性,20岁,搬重物时,突然出现胸闷、胸痛,随即出现呼吸困难并逐渐加重。
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