remove (a need or difficulty)
消除(需要,困难)
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the presence of roller blinds obviated the need for curtains .有卷帘百叶窗就不需要窗帘了。
 
avoid; prevent
避免;防止
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a parachute can be used to obviate disaster .降落伞可用于防止灾难。
 
"late 16th cent.: from late Latin