bull·frog /-ˌfrɔg, ˌfrɑg/
牛蛙,菜蛙
Bull·frog n. Zool. A very large species of frog (Rana Catesbiana), found in North America; -- so named from its loud bellowing in spring.
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bullfrog
n : largest North American frog; highly aquatic with a
deep-pitched voice [syn: Rana catesbeiana]