Many words once commonly used have fallen into desuetude.许多过去曾通用的词,今天已经废弃不用了....

desuetude的音标：desuetude的英式发音音标为：['deswɪtju:d]desuetude的美式发音音标为：['dɛswɪˌtud, -ˌtjud]...

n.废弃，不用...