There are two directions to the research of sensors: on one side, to develop new materials, principle and method; 目前对传感器的研究正趋于两个方向:一方面,研究用于传感器的新材料、原理和方法,从而得到新型的传感器;
There are two ways to apply the embedded system network access. One is constructing minor communications protocol in accordance with the principle of the TCP/ IP protocol. 实现嵌入式系统网络接入有两种选择,第一种是按照TCP/IP协议的原理编写简化版的通信协议;第二种是将已有小型的,适用于嵌入式系统的网络协议移植到系统中。
There are two theory fulcrums of ethics concern to vulnerable groups, one is the principle of morality, and the other is the principle of utility. 弱势群体伦理关怀的理论支点有两个,一是道义论原则,一是功利论原则。