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1·I bought this toy in Beij ing.

这玩具是我在北京买的。

2·First of all, the handsome young man is enjoining everyone to speak Mandar in in Beij ing.

首先，这个年轻的帅哥让每个人都说普通话。

3·Some involved welding technology is satisfactory through lots of experiments by the Beij ing Railroad Bureau.

有关焊补工艺，大量现场实验说明取得了相当满意的结果。

4·The shortwave radiocommunication between Antarctica and Beij- ing is the longest link at present time in China.

南极北京是我国目前最长的短波通信线路之一。

5·This paper deals with the effect of DDT and BHC on amino acids content in Chlorella vulgaris Beij so as to provide theoretical basis for environmental bio-engineering and biological monitoring.

本文研究的DDT，BHC对小球藻氨基酸含量的影响，可作为环境生物工程及生物监测的依据。