we call it speculation
我们称之为投机
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But my best guess is that someone on that risk free arbitrage desk moved from risk free pure arbitrage into very definitely not risk free time arbitrage, or speculation as we should call it, then the market moved against his bet.
FORBES: The UBS Rogue Trader: Yes, I Was Right
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