The two measured wave data was once a wave generation stage, and another time a decay stage.

这二次实测，一次为波浪成长阶段，而另一次为波浪衰减阶段。

youdao

And in the final stage, the industrial cluster is not necessarily going to decline, maybe there are three outcomes, namely, upgrading, transfer and decay.

在最终阶段，产业集群并不必然走向衰亡，而是存在三种可能的结果，即升级、转移和衰亡。

youdao

Left untreated, what's termed "early dental caries" -- the first stage of tooth decay -- can destroy tiny teeth and lead to infection, pain, and lifelong consequences.

CNN: Baby's teeth: What you should know

They are almost reduced to the plan, but, through the remains of towns, of canals and roads, it is possible to observe the evolution of this interaction of cultures stage by stage, from the very beginning to the period of final decay, when the Eurasian route lost its importance and the towns their economical role.

UNESCO: Culture