Is the mathematical term for the middle number in a series, or, if the series.
是在一个系列，一些中等数学术语，或者，如果系列。
Long-term supply silk fabrics series, welcome to the new and old customers call inquiries.
长期供应真丝面料系列，欢迎新老客户来电垂询。
He spent the summer working up a series of lectures for the new term.
他用了一夏天的时间准备新学期的讲稿。
He spent the summer working up a series of lectures for the new term.
我花了整个夏天准备一组新的讲稿。
He spent the summer working up a series of lectures for the new term.
我花了整个夏天准备一组新的讲稿。
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