当刺激出现时，婴儿吮吸行为的变化被记录下来。
As stimuli were presented, changes in the infant's sucking behavior were recorded.
1969年，研究者们首次将无营养吮吸次数的增加作为评估标准。
Increases in nonnutritive sucking were first used as an assessment measure by researchers in 1969.
他们能做的事情之一就是吮吸，这些婴儿听到法语时会去吮吸奶嘴。
One of the things they can do is suck, and these babies would suck on a pacifier when hearing French.
吮吸次数的增加表明婴儿注意到或是喜爱眼前出现的物品。
Increases in the number of sucks were used as an indicator of the infant's attention to or preference for a given visual display.
吮吸次数的增加表明婴儿注意到或是喜爱眼前出现的物品。
Increases in the number of sucks were used as an indicator of the infant's attention to or preference for a given visual display.
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