Previewing by red light, focusing by double red lights, and equipped with LED lighting.

单红光预览，双红光对焦，配备LED照明。

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Motor controller for up-down stage automatically, double red light for focusing, multi-humanized design.

电动升降，双红光对焦，多项人性化设计。

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Figure 2: Axial T2 image through the level of the sacrum demonstrates an isointense lesion originating in the right sacral ala which is invading the S1 and S2 exiting nerve roots. (double red arrows).

骶骨轴位T2序列显示起源于右侧骶骨翼的等信号的病灶，病变浸润骶1、2椎体外侧神经根。

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London may be famous for its red double-decker buses, but it is the underground system, parts of it more than a hundred years old, that is especially vulnerable.

VOA: standard.2010.04.01

If I had a beaker sitting on the table here and it contained a million blue double stranded DNA molecules and a million red double stranded DNA molecules and I heated it up and added a little base, I'd soon have four million individual strands just floating around in the solution because I've broken up this hydrogen bonding and the DNA molecules fall apart.

假如我这里有一个烧杯 里面,盛有一百万条蓝色DNA双链和,一百万条红色DNA双链,然后我稍微加热一下烧杯,并且加一些碱,很快我就有了四百万条DNA单链,漂浮在溶液里,因为我已经使得氢键断裂,DNA双链也随之打开

耶鲁公开课 - 生物医学工程探索课程节选

Between the 1950s and 2000s, royal red double deckers sported distinctive open platforms in the rear.

BBC: London's iconic buses are back

Once out in traffic, I appreciated how the electric motor assistance gave me the necessary speed to keep up with the red double-decker buses.

BBC: Rent an electric bike in London

Admittedly, London's dwindling fleet of old-fashioned double-decker red Routemaster buses, like the black taxis and old red telephone boxes, are a distinctive and attractive feature of the city's landscape.

ECONOMIST: Why mourn creaky old buses when you can welcome new ones