中文名称 肉眼观测 英文名称 nakedeyeobservation
给它安装无线电设备是很困难的，而且仅凭肉眼观测也太不可靠，无法对它的行为进行确切的观察。
Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
如今，科学家试验了一种新的方法，通过测量人类肉眼观测不到的植被释放物质，监测其健康状况。
Now scientists have tested a new method for monitoring the health of vegetation by measuring emissions that the human eye cannot detect.
正品卷烟与假冒品牌卷烟在感观上几乎没什么差别，很难通过肉眼观测或凭人鼻闻嗅来识别。
There is little difference between counterfeit and genuine cigarettes and it is almost impossible to identify the fake cigarettes by looking at their shapes or via smelling aroma by human nose.
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