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雲ひとつない， 雲一つない， くもひとつない

1. cloudless (sky), without a cloud (in the sky)

无云的晴空，无云的天空

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青空， あおぞら

1. blue sky

蓝天

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広がる， 拡がる， ひろがる

1. to spread (out), to extend, to stretch, to reach to, to get around, to fill (e.g. a space)

展开，扩散，延伸

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