Objective: to identify the risk factors of Spontaneous premature delivery.
目的：探究自然早产的高危因素。
Pregnant women risk dehydration and premature delivery when they have flu, she said.
孕妇在患流感时更容易脱水和早产，她说。
Objective: To study the relationship between periodontal diseases and premature delivery.
目的：探讨牙周疾病与早产的关系。
Objective: To study the relationship between periodontal diseases and premature delivery.
目的：探讨牙周疾病与早产的关系。
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