More and more frequently, workflows are a combination of the two types.

更为常见的是，工作流是这两种类型的结合。

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But the H1N1 2009 is an entirely new combination of four genetic elements: a bird flu, some human flu genes and two types of swine flu.

但2009年的H1N 1流感结合了四种基因成分，因而是全新的。这四种基因成分分别是：禽流感，一些人流感基因，以及两种猪流感。

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The latest thinking is that combination therapy - taking both of the two main types of B.P.H. drugs - achieves maximum benefit.

如今正在考虑一些联合治疗方案——使用两种主要的B.P.H .药物——以得到最大的好处。

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According to the National Cancer Institute and American Cancer Society, secondhand smoke is the combination of two types of smoke that is produced when burning tobacco: the smoke that comes from the burning end of a cigarette, cigar or pipe and the smoke that is exhaled by the smoker.

CNN: Study: Smoke-free laws may cut heart attack hospitalizations