多重级数 multiple series ; several multiple series 循环级数 recurring series ; cyclic series ; number of stages ..
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several multiple series
几个倍数级数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I have spent a significant amount of my time over the last several years on a series of projects across multiple industries in locations all over the world.
在过去几年中，我在世界各地的多个行业中的一系列项目上花费了很多时间。
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He has started several small businesses, received multiple patents and is the founder of mysmallbusiness101.com, a small-businesses support seminar series.
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