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bless3717金虫 (正式写手)
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upon的特殊用法
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The graphene oxide upon exfoliation carries sufficient functional groups (e.g., epoxides, hydroxyls, carboxylic acids) to render itself suspendable in polar solvents. It has been shown that removal of coexisting metal ions and/or functionalization with amines keeps these graphene sheets from collapsing upon chemical reduction with hydrazine. 你能找到几个upon？第二句什么意思？  |
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