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syncopenoun [ U ]uk/ˈsɪŋ.kə.pi/ us/ˈsɪŋ.kə.pi/ also fainting episode specialized

a short period of time when a person becomes unconscious晕厥

Postural syncope occurs when the body cannot supply enough blood to the brain in the upright position because of low blood pressure.直立时因血压过低导致大脑供血不足时会出现直立性晕厥。

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