perpetual /pɚˈpɛtʃəwəl/ adjective Learner's definition of PERPETUAL
1
: continuing forever or for a very long time without stopping持续不断的；长久的 -
The region is in a state of perpetual war.这一地区战争不断。
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He seems to have a perpetual grin on his face.他似乎总是面带笑容。
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(humorous) the perpetual student/bachelor长期留级生/单身汉
2
: happening all the time or very often无休止的；经常发生的