找到你肚皮的中心，呼气时挺肚子，吸气时收腹。
Find your center in your belly as let your belly expand out when inhaling and let it contract when you exhale.
方法腹部超声诊断输尿管中下段结石采用吸气、收腹、重压探测、交替探测等方法。
Methods Inspiration, abdomen contraction, deeply press exploration and alternate exploration are adopted in abdominal ultrasonography to diagnose middle-lower ureteral calculi.
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