小鸡们花了21天才从蛋里孵化出来。
The chicks took 21 days to ___hatch from their eggs.
小鸡刚刚破壳而出。
The chick just ___hatched.
船员们关上甲板上的舱口以防海水进入。
The sailors closed the ___hatches on the deck to prevent seawater from entering.
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