secondly /ˈsɛkəndli/ adverb Learner's definition of SECONDLY
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used to introduce a statement that is the second statement in a series其次，第二，第二点（用于引出一系列陈述） -
I'm moving because, for one thing, my apartment is too small, and, secondly, I found one closer to my job.我要搬家，一是因为我的公寓太小，二是我另找到了一处上班比较近的公寓。
— compare firstly, thirdly