UNIT 15: four two-person product-related conversations at a trade fair;
单元15：四段两人在展会上关于商品的对话；
As the name suggests, this is four two- or three-rank lines of infantry arranged as a hollow square, with everyone facing outwards.
如它的名字一样，方阵由四组排成两线或三线的步兵组成一个空心正方形，所有人都朝向外侧。
The experimental study on the performance of nucleate boiling of R22 outside the surface enhanced evaporation tubes was conducted by use of four two-sides enhanced tubes with different geometries.
介绍了表面增强型蒸发强化管，并对氟利昂制冷工质R22在该管外的沸腾换热进行了实验研究。
This brings the total number of laboratory confirmed cases in Turkey to four. Two of these cases were fatal.
这使土耳其经实验室确认的病例总数达到4例，其中2例已经死亡。
At present in domestic, the Accounting firms can be divided into "big-four" and "non-big-four" two broad categories.
目前在国内，按照会计师事务所规模及背景可分为“四大”和“非四大”两大类。
At present in domestic, the Accounting firms can be divided into "big-four" and "non-big-four" two broad categories.
目前在国内，按照会计师事务所规模及背景可分为“四大”和“非四大”两大类。
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