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吸烟在妊娠期间是危险的因素。母方吸烟会使婴儿的出生体重减轻150～250克(与吸烟量有关),同时会使婴儿的体重和身长左迁(译者按:左迁即降低)。孕妇吸烟会影响胎儿的和氧作用,因为在母孩双方的血
Smoking is a dangerous factor during pregnancy. Maternal smoking can reduce a baby’s birth weight by 150 to 250 grams (depending on the number of cigarettes smoked), while leaving the infant’s weight and length to move to the left. Smoking in pregnant women can affect fetal and oxygen effects because of blood on both sides of the mother