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词汇 contractions
例句 She felt contractions every two minutes.她每两分钟会感到一次宫缩。Premature beats that occur in the atria are called premature atrial contractions.出现在前房的期外搏动被称为早发性心房收缩。Foods and fluids are mixed in the stomach by its muscular contractions.胃里的食物和液体通过肌肉收缩混合在一起。From her first contractions to the birth of the baby took only three hours.从她第一次宫缩到孩子出生只用了三个小时。She started having contractions two weeks before her due date.她在预产期前两周就开始宫缩。
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