aback [əˈbæk]

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adv.向后地；退后地；adj.处于顶风位置的

to be very shocked or surprised

The little girl screamed and it took us aback.小女孩的尖叫声吓了我们一跳。
Jenny was taken aback by some of the portraits.其中一些肖像画使詹妮大吃一惊。