The beam of Sanmenjiang bridge is the discrete simple-box double-cell girder.

三门江大桥主梁采用分离式单箱双室结构。

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Database type: SQL Server (TIP: you can simply double-click this cell to change it).

Database type： SQL Server(提示：可以双击这个单元格更改值)。

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These are hula-hoop-shaped double-stranded units of DNA that can be moved easily from one cell to another.

它们是形似呼拉圈的双股dna单位，可以被轻易地从一个细胞转移到另一个细胞。

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The HIV retrovirus, in particular, is a single-stranded RNA virus that duplicates itself in a host cell by converting its genetic code into double-stranded DNA that is then inserted into the host cell.

FORBES: Progress in Drug Therapy Marks the 25th Anniversary of World AIDS Day

The additional front-wheel drive called for a newly designed front axle: unlike the series production vehicle with AMG V8 engine, which has a double wishbone axle, the SLS AMG E-CELL features an independent multi-link suspension with pushrod damper struts.

ENGADGET: Visualized: Mercedes-Benz SLS AMG E-Cell bares all

According to the Sunday Telegraph, documents sent by MI6 to Libyan intelligence chief Moussa Koussa reveal a double agent was recruited to infiltrate an al-Qaeda terror cell.

BBC: Gaddafi