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每个雌体四五月份只产一粒卵。Each female will lay just one egg in April or May.临近排卵期，雌激素的分泌量随之增加。As ovulation gets nearer, oestrogen levels rise.覆巢之下无完卵.When a bird's nest is overturned, no egg can remain intact....

“卵”的拼音为：luǎn...