这种威胁与日俱增：与去年相比，今年的事故率是去年的2倍，甚至达到了3倍。
The threat is increasing rapidly; this year has seen a doubling, or even tripling, of the incident rate over last year.
这种威胁与日俱增：与去年相比，今年的事故率是去年的2倍，甚至达到了3倍。
The threat is increasing rapidly; this year has seen a doubling, or even tripling, of the incident rate over last year.
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