Under different pressures the flashing in riser of natural circulation system and its effect on flow stability were studied by the method of visual observation in synchronism with data recording.
采用可视化观察与数据同步记录分析相结合的方法，研究了不同压力条件下自然循环系统上升段中的闪蒸现象及其对自然循环稳定性的作用。
The grazing behavior of Kerqin cattle was studied with the whole day long eye observation method in the spring of 2002 at a natural pasture.
2002年春季在内蒙古科左后旗的天然草场上，采用跟群放牧全日观察法，定量研究了自然放牧状态下成年科尔沁牛牧食行为。
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