DNA and RNA are made of nucleotides. Each unit is a three-part molecule with a phosphate at one end, a sugar in the middle and a variable nucleobase at the other end.

DNA和RNA都是由核苷酸构成，每一单元为由三部分组成的分子，一端是磷酸盐，中部是一种糖，另一端是碱基。

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There should be ample natural light, for example, entering through the windows and no open air shafts in the middle of the unit. Also, space should not abut fire-escape stairs.

比如说，房间的自然采光需要非常充足啦，建筑空间的中部不能设置通风口啦等等。

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Even stateside, where it was the middle of the night, traffic was up 31 percent, according to SAP's Sybase unit, which compiled all this vital messaging data.

SAP数据库综合了这次信息发送的关键数据，数据显示，即使时值美国本土的午夜时分，信息流量仍达31%。

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On the flipside was there Middle East, Africa, and Eastern Europe unit, which saw shipments grow 3%.

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Last year Morgan lowered its pre-tax profit margin goal for the unit to 15% for the middle of 2013.

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Yesterday Motorola CEO Greg Brown told board members and shareholders that, among a lot of other bad news, the company is no closer to finding someone to lead the company's rotting cellphone business (which Moto is in the middle of spinning off as its "Mobile Devices" unit).

ENGADGET: Motorola's cellphone business needs a new leader: okay, I'm in.