我们已经知道叶酸降低风险的神经管缺陷，包括脊柱裂。
We already know that folic acid reduces the risk of neural tube defects, including spina bifida.
神经管缺陷儿出生素质差，围产期病死率高，预后不良。
Babies with NTDs are in poor birth quality, higher perinatal mortality and poor prognosis.
了解神经管缺陷的基本分布情况，分析其环境及行为危险因素。
To understand the basic distribution of neural tube defects and analyze the environment risk factors.
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