mid trimester of pregnancy [妇产] 妊娠中期 ; 中期妊娠
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Cervix lymphatic hygroma; Ultrasonic checkup; Mid trimester of pregnancy; Late pregnancy; Foetus.
颈淋巴水囊瘤；超声检查；妊娠中期；妊娠末期；胎儿。
The serum nitric oxide level in mid-trimester was significantly higher than that in early pregnancy(P<0.01), and decreased in late trimester serum.
中期妊娠妇女较早孕妊娠妇女明显升高（P<0.01），晚期妊娠妇女有所下降；
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