单词	rockoon
释义	rockoon noun rock·​oon (ˈ)rä¦kün plural -s : a small rocket carried to a high altitude by a balloon and then fired Word History Etymology rock(et) + balloon
随便看	harbormaster harbormasters harbors harborside harborward harbour harbourage harbourages harboured harbourer harbourers harbourful harbouring harbourless harbours harbourward hard hard as a rock hard as nails hard beech hard brick hard by hard candy hard cash hard cheese

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