The committee for the class picnic party made careful plans for a beech party but they reckoned without a sudden change in the weather. 班級野餐委員會精心計劃了海灘交誼會，但是他們沒有料到天氣的突然變化。
Be on the watch for a sudden change in the patient's condition. 要密切注意病人病情可能突然變化。
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