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[法](偶然发现并被认为具有艺术价值的)天然艺术品
🗣️ 情景例句
I don't know.
我不知道。
Never neglect an opportunity for improvement.
抓住大好时机，切莫等闲错过。
After switching on powerful arc lights, they saw great stalagmites -- some of them over forty feet high -- rising up like tree-trunks to meet the stalactites suspended from the roof.
他们打开强力弧光灯，看见一株株巨大的石笋，有的高达40英尺，像树干似地向上长着，与洞顶悬挂下来的钟乳石相接。