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| synergistic effect of toxic substances 1. A state in which the combined effect of two or more substances is greater than the sum of the separate effects. 2. An effect whereby two toxic substance together have more of an impact than anticipated (1. 在一个国家里，两个或两个以上的物质结合效果总和比单独作用的效果强。 2. 作用，使两种有毒物质具有一个共同的影响比预期的更强。) | |||