Using two-flow model, small perturbation theory and solvable conditions of one-order linear equations, a dispersion equation of pressure wave in horizontal air-liquid bubbly flow was proposed.

利用两流体模型、小扰动原理和线性一阶齐次方程组有解的条件，得到了气液泡状流型下的压力波色散方程。

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If two flying insect populations took up residence in separate nearby valleys, chances are that individuals from each population would fly back and forth, continuing gene flow.

如果有两个飞行昆虫种群居住在相距不远的不同山谷中，那么任一种群中的个体都有可能来回飞行，从而使基因流动继续。

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Notice that we've used two different mediation flow components for the two different routes.

注意到，我们为两个不同路由使用了两个不同的中介流组件。

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The bridge will remain open to two-way traffic flow and there will be no impact on pedestrians or cyclists.

BBC: Weight limits placed on 'deteriorating' Derby bridge

According to Peter Tasker of Dresdner Kleinwort Benson, depreciation equals around two-thirds of Japanese firms' cash-flow, profits only one-third.

ECONOMIST: Tax reform runs late

They began selling the watches in 2010 and had a nearly two-year record of cash flow before seeking financing to expand.

WSJ: Monetize, Monetize, Monetize: Startups need to make money fast.