一种银白色软质单价元素，碱金属属，已知最轻的金属，存在于许多矿物中。
A soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals.
一种银白色软质单价元素，碱金属属，已知最轻的金属，存在于许多矿物中。
A soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals.
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