Mothers reported their smoking habits at the 17th week of gestation and their child's externalizing behavior at 18 months of age by means of standardized questionnaires.

这些母亲报道其怀孕第17周时的吸烟习惯，在其孩子18月龄时通过标准化问卷评价表面化行为。

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The challenge in externalizing identity is the degree to which the existing app must be modified and whether changes would change its behavior.

在外化身份时挑战在于现有的应用要修改到一个什么样的程度，这些变更要不要影响到它的行为。

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