With high-speed wind tests of scale models under way, the blended wing could take flight before 2020.

目前，等比例模型的高速风洞测试正在进行中，预计混合机翼能在2020年前起飞。

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The flapping wing represents a small change in the initial condition of the system, which causes a chain of events leading to large-scale alterations of events.

翅膀的扇动代表了在系统初始条件中的一个小小的改变，而这改变引发了一连串的事件，导致了事件的大幅度改变。

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Residential layout neat, large scale, but the front wing has been changed after the brick room also has been transformed.

民居布局规整齐，规模较大，但前厢房已改砖砌，后厢房也已改造。

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The moderators also brought up William Ayers, a 1970s-era purveyor of left-wing, small-scale terrorism, who once sat on a charity board with Mr Obama, and had hosted a fundraiser for his state senate campaign in the 1990s.

ECONOMIST: A bizarre debate in Pennsylvania