gestation
[dʒɛˈsteʃən]
n.
怀孕;
怀孕期;
（思想、主意等的）构思、酝酿;
孕育（过程）;
例句:
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The gestation period can be anything between 95 and 150 days.
妊娠期从95天至150天不等。
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a baby born at 38 weeks' gestation
怀孕38周时出生的婴儿
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This film was two years in gestation.
这部电影酝酿了两年.
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The gestation period lasts for about five or six months.
来自BBC
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Why has the gestation period been so extended?
来自THETIMES
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Each one of us focusses on a different length of gestation.
来自NEWYORKER