early warning
柯林斯詞典
1. ADJ An early warning system warns people that something bad is likely to happen, for example that a machine is about to stop working, or that a country is being attacked. 預(yù)警[ADJ n]
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1. ADJ An early warning system warns people that something bad is likely to happen, for example that a machine is about to stop working, or that a country is being attacked. 預(yù)警[ADJ n]