由于飞机坠落的准确时间不确定，搜救工作也变得复杂。
Search and rescue efforts have also been complicated by uncertainty about the precise time the jet went down.
我们对时间不确定；Were not sure about going。
其次，构建了交货时间不确定的两供应商-单制造商协同供货模型。
Second, supply coordination model of two-suppliers and one-manufacturer under uncertain delivery time was established.
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