名词
中文翻译：Unknown
同义词：
['egg-laying period', 'incubation period', 'hatching period']
例句：
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1. Thechickens are laying eggs at this time of year.
今年这个时候，鸡在下蛋。
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2. The scientists have been studying the behavior of these birds during their incubation period.
科学家们一直在研究这些鸟在孵化期间的行为。
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3.The fish spawn in the spring and spend the entire brood time in the water.
鱼类在春天产卵，并在水里度过整个孵化期。