High levels of lead could damage the intellectual development of children.
高含铅量会损害儿童的智力发育。
Objective: To study the influence of intimate health maintenance on infant's intellectual development.
目的：了解亲子保健对婴儿智能发育的影响。
Objective: To study the influence of intimate health maintenance on infant's intellectual development.
目的：了解亲子保健对婴儿智能发育的影响。
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