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It's hard to discern his true intention in such a short period of time.
要在如此短的時間內看出他的真正企圖是好難的。
discern,看出，辨出。
discern good from evil分辨善與惡。
He almost could not discern the road in the dark.他幾乎不能在黑暗中辨認出路來。