incidentally /ˌɪnsəˈdɛntl̟i/ adverb Learner's definition of INCIDENTALLY
1
: as something that is less interesting or important附带地；伴随地 -
The report discusses the problem only incidentally. [=in passing]这份报告只是附带地谈了一下这个问题。
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Not incidentally, the market slump was followed by widespread layoffs.自然而然，市场疲软后接着就是大范围裁员。
2
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used to introduce a statement that provides added information or that mentions another subject顺便提一下；顺便说一句 -
I recently met his wife who, incidentally [=by the way], is a well-known author.我最近碰到了他的妻子；顺便提一句，她可是一位著名作家。
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This product is the best—and, incidentally [=by the way], the most expensive—of its kind.这种产品质量最好；提一下，也是此类产品中最贵的。
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Incidentally [=by the way], I saw Susan yesterday and she asked about you.顺便提一下，我昨天见到苏珊了，她还问起了你。