When you buy things, you can take out your phone and then scan the two-dimension code, the bill is paid.
当你买东西时，你可以拿出你的手机，然后扫描二维码，支付账单。
A two-dimension model for the flow field in catalytic converter was established, and the steady state flow was simulated with the computational fluid dynamics (CFD) code.
利用计算流体动力学(CFD)软件，建立了催化转化器流场的二维模型，对催化转化器的稳态流动进行了数值模拟。
Based on the two-dimension theory, a computer code is made in FORTRAN language to design the high specific speed mixed-flow pump.
基于二元理论，用FORTRAN语言编程实现了高比转速混流泵叶轮的水力设计。
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