These various contaminants are suspended in, adhered to or absorbed on the foregoing gases and objects and they may exert {TAIL ~ mortal, acute, subacute, chronic or transient adverse effects} on the health of human beings and other animals when they absorb such contaminants and come in close contact therewith, they may thus give them unpleasant feelings and they may cause environmental pollution through the discharge, leakage and {HEAD ~ accumulation} thereof 
These various contaminants are suspended in , adhered to or absorbed on the foregoing gases and objects and they may exert { TAIL ~ mortal , acute , subacute , chronic or transient adverse effects } on the health of human beings and other animals when they absorb such contaminants and come in close contact therewith , they may thus give them unpleasant feelings and they may cause environmental pollution through the discharge , leakage and { HEAD ~ accumulation } thereof
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