求翻译：由环境污染导致的环境效应具有滞后性，在污染发生的时候不易被发现，然而一旦发现就表示环境污染已经发展到相当严重的地步。是什么意思？

Environmental pollution caused by the environmental effect with a lag, when the pollution occurred is difficult to detect, but once discovered that environmental pollution has been developed to a very serious stage.

Environmental pollution caused by the environmental effects of a lag in response to pollution when it is not easy to be found, however, once it is found that the environmental pollution has reached a very serious stage.

The environment effect causes which by the environmental pollution has the hysteresis quality, occurs in the pollution time was discovered not easily, once however discovered already developed the quite serious situation on the expression environmental pollution.

Environmental effects caused by environmental pollution have lagged, in pollution are difficult to be found, however, once found, has developed to a considerable level of environmental pollution.

Environmental effects caused by environmental pollution have lagged, in pollution are difficult to be found, however, once found, has developed to a considerable level of environmental pollution.