/ bəˈluːn / noun
a very large balloon that is filled with hot air or gas and can carry people in a basket hanging under it:
People first flew in a balloon in 1783. 人類於1783年首次乘熱氣球飛行。
hot-air balloon

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/ ˈer.ə.nɑːt / noun
someone who travels in a flying vehicle such as a hot-air balloon or airship:
This was the first time an aeronaut had crossed the Pacific Ocean alone in an air balloon. 這是飛翔員第一次獨自駕駛氣球飛越太平洋。

( 熱氣球 Cambridge Chinese (Traditional)-English Dictionary 的翻译 © Cambridge University Press)