别墅是住宅皇冠上的明珠。
钢琴这一乐器之王，通常被人们誉为音乐皇冠上的明珠。
Piano the king of instruments, usually known as the Pearl of the crown of music.
这次俄罗斯却将“皇冠上的明珠”拿出相当一块儿来（以低于市场价的水平）卖给这样一位买家，可见俄罗斯是多么需要资金。
That Moscow would sell a big chunk of its crown jewel (below market) to such a buyer illustrates how badly it needs the money.
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