- The quantitative token of the residual age index of DDT in soils was primarily discussed,and the normalized residual time index(NRTI) of DDT was designed as one of the methods.
- The transfer from qualitative research to quantitative analysis showd the inevitable tendency of research on the residual age index of dichlorodiphenyltrichloroethane(DDT) in soils.
- In 1997,the valid tiller ending phase and maximum tiller phase delayed and leaf ages index increased in medium and late tillering phase under high-temperature.
- The drainage system has been aged.
- He prefers to assort with people of his own age.
- The aged is taken care of in the old folks home.