... 儿童科学素质：children's science-technology quality 二级离子交换：second order exchange 二苄叉山梨醇：Dibenzylidene Sorbitol ...
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second order exchange
二级交换
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In a flash order, a firm wishing to buy or sell stock can elect to freeze the order on an exchange for as long as half a second.
WSJ: Ban on Flash Orders Is Considered by SEC
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