A pregnancy is divided into three phases, or trimesters.
怀孕可以分成三个阶段，也可以说三期。
Most of those pregnant women were in their second or third trimesters, when the risk of flu complications is believed to be highest.
这些孕妇大多是在其第二及第三期，当流感并发症的风险被认为是最高的。
Most of those pregnant women were in their second or third trimesters, when the risk of flu complications is believed to be highest.
这些孕妇大多是在其第二及第三期，当流感并发症的风险被认为是最高的。
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