I bought this toy in Beij ing.

这玩具是我在北京买的。

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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。

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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。

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