有无三眼照相观察镜筒 Trinocular Phototube
要观察到更多种鸟儿，你可能需要长途跋涉，走过崎岖不平的难走的地势，还要背负装着观鸟指南、双筒望远镜、单筒望远镜和其他器材的野营包。
Observing many different species of birds may require long hikes and walks over uneven and challenging terrain while carrying a field bag with guides, binoculars, scopes and other equipment.
在筒体的上边设有观察清理孔，因而清理方便快速。
The upper side of the barrel body is provided with an observation cleaning hole; therefore, the cleaning is convenient and quick.
首先采用单筒连续变倍视频显微镜观察试品表面，利用表面能理论分析表面接触角随着盐雾电导率的增大而减小。
Based on the surface energy theory, it can be found that the contact angle decreased with increasing the saline-fog conductance.
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