hǎi海seakuò阔widetiān天skykōng空empty
As wide as the sea and sky; boundless; fig. to talk at random; to let one's imagination run wild.
Literal meaning
sea (海) — wide (阔) — sky (天) — empty (空)
Origin
A classical four-character phrase describing a vast and boundless space.
Examples
tā他men们hǎi海kuò阔tiān天kōng空de地liáo聊zhe着wèi未lái来de的jì计huà划。
They were talking freely about their future plans.
tā他de的xiǎng想xiàng象lì力hǎi海kuò阔tiān天kōng空，bù不shòu受rèn任hé何xiàn限zhì制。
His imagination is boundless and unrestricted.
Usage & nuances
Can be used to describe a physical space or a state of mind.
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