To be utterly at a loss or bewildered, not knowing what is going on or how to react.
面对突如其来的变化，他一时不知头脑，愣在那里。
Faced with the sudden changes, he was at a loss for a moment, standing there dumbfounded.
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To be utterly at a loss or bewildered, not knowing what is going on or how to react.
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