英语翻译
Alltheirarmoureddivisionsorwhatwasleftofthemtogetherwithgreatmassesofinfantryandartillery,hurledthemselvesinvainupontheever-narrowing,ever-contractingappendixwithinwhichtheBritishandFrencharmiesfought.
这是丘吉尔演讲weshallneversurrender里的话,帮我翻译一下,尤其是ever-narrowing,ever-contractingappendix,这两个单词是什么意思.