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.
该星系在无月夜的夜晚可由肉眼观测到一个小光斑，它也是不借助望远镜能被肉眼观测的最远天体。
The galaxy is visible to the naked eye on moonless nights as a smudge of light and is the most distant object visible without a telescope.
在1952年炎热的夏天，在华盛顿特区的国家机场附近发生了一系列令人激动的雷达和肉眼观测报告。
In the hot summer of 1952 a provocative series of radar and visual sightings occurred near National Airport in Washington, D. c.
直径只有几厘米，甚至连肉眼都难以观测到。其热量比电炉高20倍，能轻易地穿透弹壳。
Only a few centimeters in diameter and invisible to the naked eye, the Avenger's laser is 20 times hotter than an electric stove top and will cut through artillery shells with ease.
这些信息能否作为一个平台，供开发人员创建应用，社会观测人员寻求有关我们自身的发现，那些用肉眼无法发现的事情？
Will that information serve as a platform for developers to build applications and for social observers to tell us things about ourselves that we never could have seen without a bird's eye view?
艺术家罗伯特·赫特博士和蒂姆·派尔将斯皮策太空望远镜观测的科学数据转化为视觉效果图，但其所表现的对象没办法用肉眼直接看到。
Spitzer artists Dr. Robert Hurt and Tim Pyle turn the space observatory's streams of scientific data into visual renderings of objects no one - not even them - has ever seen before.
双子座流星雨相较于其它流星雨来说，速度较慢，为中速，约每秒35.41公里，肉眼容易观测。
Geminid meteors are fairly easy to spot because they travel at about 35.41 km per second, which is relatively mild compared to other forms.
斯皮策太空望远镜在沿着轨道旋转时，收集了来自广阔太空的各种光线，这些光线对于肉眼来说是不可见的，但红外设备可以观测到，观测结果形成数据被传回地球。
Spitzer's infrared instruments return reams of data to Earth as the orbiting observatory gathers light from far reaches of the universe, light that is invisible to the naked eye.
经常有彗星被甩出奥尔特云(在太阳系边缘的彗星群)，并靠近地球到肉眼可以观测的距离。
Every so often a comet gets flung out of the Oort Cloud, a swarm of comets on the fringes of the solar system, and gets close enough to Earth for us to see it.
单凭肉眼是观测不到海王星的。
虽然两颗星体在明净的天空都能够用肉眼看到，但是用一副双筒望远镜能更好观测。
Binoculars help out with the search, although both worlds are actually visible to the unaided eye in a clear sky.
在一月底之前，这颗彗星仍然保持著肉眼可见的亮度，但是只有南半球的人可以观测得到它。
The unexpectedly bright comet should remain visible to observers in the southern hemisphere with unaided eyes for the rest of January.
无仪器辅助情况下，肉眼不可观测到的活体生物，如细菌，霉菌，病毒或寄生物等。
Living things such as bacteria, molds, viruses and parasites that cannot be seen with the unassisted human eye.
最大撞击力是指应用在测试样品表面上但没有出现肉眼可观测到损伤或变形的最大撞击力(单位：英寸磅)。
Maximum impact force is the greatest impact force (in inch-lbs) applied that did not cause visible damage or deformation to the test specimen surface.
因为它们发生得太快，人的肉眼无法观察到，只能通过仪器才能观测到。
Because they occur too fast to be seen with eyes, they can be detected only by instruments.
在肉眼和手术显微镜下，观测了30侧（足母）短伸肌、趾短伸肌以及它们的血管和神经。
The m. extensor hallucis brevis and m. extensor digitorum brevis and their blood vessels and nerves of 30 feet of Chinese cadavers are observed and measured under the operative microscope.
如果要观测土星，且想用肉眼就看到这个最遥远的星球，你得心甘情愿的在日出一个小时更甚前起床。
To catch Saturn, the farthest world that you can easily see with the unaided eye, you must be willing to get up an hour or more before sunrise.
现在，有一定概率的Elenin彗星大约在八月中旬会变成一个很明显的双筒望远镜观测目标，并在近日点附近的几星期达到肉眼可见的程度。
Right now, odds are that Comet Elenin will become an easy target for binoculars around mid-August and reach naked-eye visibility for a couple of weeks around perihelion.
现在，有一定概率的Elenin彗星大约在八月中旬会变成一个很明显的双筒望远镜观测目标，并在近日点附近的几星期达到肉眼可见的程度。
Right now, odds are that Comet Elenin will become an easy target for binoculars around mid-August and reach naked-eye visibility for a couple of weeks around perihelion.
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