If you have any Dragons to recruit, I recommend you save money for a Dragon instead of buying Hydras, due to Dragon's high versatility.
如果你可以招募龙的话，我建议你省下招募海德拉的钱去买龙，因为龙实在太全能了。
Coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes.
以世代交替为特色的腔肠动物；通常群居的水螅阶段先于水母阶段；水螅和水母。
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