银行娇妻沈丹1一14

PTOV
银行娇妻沈丹1一14
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银行娇妻沈丹1一14

ELEMENT:
Samarium
SYMBOL:
Sm
ATOMIC NUMBER:
62
银行娇妻沈丹1一14

   
 
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PTOV is created by video journalist Brady Haran working with chemists at The University of Nottingham