a. 在逐步废弃的

[ adj ]
becoming obsolete
<adj.all>

Obsolescent \Ob`so*les"cent\, a. [L. obsolescens, -entis, p. pr.
of obsolescere, to wear out gradually, to fall into disuse;
ob (see {Ob-}) + solere to use, be wont.]
Going out of use; becoming obsolete; passing into desuetude.

noncurrent \noncurrent\ adj.
not current or belonging to the present time. Opposite of
{current}. [Narrower terms: {back(prenominal), out-of-date};
{discontinued, out of print(predicate), out of
production(predicate), out of use(predicate)}; {disused,
obsolete ; {obsolete, outdated, outmoded, out-of-date,
superannuated ; {obsolescent ] Also See: {old}, {past}.
[WordNet 1.5]