gas giant
柯林斯词典
1. N one of the four planets in our solar system that are composed chiefly of hydrogen and helium, namely Jupiter, Saturn, Uranus, and Neptune 氣態巨行星; 太陽系中主要由氫和氦組成的4大行星，即木星、土星、天王星和海王星
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1. N one of the four planets in our solar system that are composed chiefly of hydrogen and helium, namely Jupiter, Saturn, Uranus, and Neptune 氣態巨行星; 太陽系中主要由氫和氦組成的4大行星，即木星、土星、天王星和海王星