According to the class state diagram, taking class-valves as the main object of observation, class tests are carried out simultaneously combining with the class method testing.
该方法以类状态图为依据，以类阀为主要观察对象，结合类方法测试去同步地实施类测试。
In physical experiments of ancient China, water was not only the object of observation and study, but also an experimental material, and it could sometimes become an experimental apparatus as well.
在中国古代，水既是物理实验观察和研究的对象，也是物理实验材料，有时还能成为实验器件。
America should become an object of explicit observation (not thoughtless imitation) while China remains a topic of concern and memory.
美国应该成为一个可看可摸的观察对象(而不是不加思考的模仿)，而中国则应成为时时关心与回忆的话题。
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