appreciable
adjective uk/əˈpriː.ʃə.bəl/ us/əˈpriː.ʃə.bəl/
明显的；可察觉的；值得重视的；可观的
If an amount or change is appreciable, it is large or noticeable enough to have an important effect.
There has been an appreciable drop in the number of unemployed since the new government came to power. 自从新政府执政以来，失业人数明显下降。