这使得测量颈部透明作为一种潜在的有用的第一孕期筛检工具。
This leaves the measurement of nuchal transparency as a potentially useful 1st trimester screening tool.
唇腭裂发生在怀孕女性的第一孕期，而这时候很多女性可能还不知道自己已经怀孕。
Oral clefts happen early in pregnancy, before many women even know they are pregnant.
他们建议在第一孕期时，磺胺类药物或呋喃妥因在没有其他合适的可替代药物的情况下使用仍被认为是适当的。
They suggest that prescribing sulfonamides or nitrofurantoins in the first trimester is still considered appropriate when no other suitable alternative antibiotics are available.
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