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商务合作
The witness is speculating as to the content of the seized packages.
请问这里为何要加 as to，而不是直接speculating the content of?
The witness is speculating as to the content of the seized packages.
【翻译】证人正在推断被查获的包裹的内容（所装物品）。
speculate 在本句用作不及物动词，意为“猜测；推断；预测”。as to = about
speculate as to =speculate about：对......作出猜测/推断/预测。
He can only speculate as to which horse will win the race.
他只能推断哪匹在赛马中会获胜。
Its always hard to speculate about the future.
将来一向非常难预测。
来自柯林斯例句
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