肉眼

However, we'll use tonight's moon to locate something that we can't see with the unaided eye anyway.

然而，我们要用今晚的月亮来定位一些我们用肉眼看不到的东西。

The microscope is an optical device used to view materials that are too small to be seen by the unaided eye.

显微镜是一种用于放大微小物体使其成为人的肉眼所能看到的光学仪器。

These six to seven stars are easily seen with the unaided eye.

这些六或七星最早是通过肉眼观测到的。

Too small to be seen by the unaided eye but large enough to be studied under a microscope .

非用显微镜不可见的；微观的用肉眼不可见的但是可以用显微镜观察的

That comet is invisible to the unaided eye.

那颗彗星只用肉眼是看不到的。

A Too small to be seen by the unaided eye but large enough to be studied under a microscope.

非用显微镜不可见的；微观的：用肉眼不可见的但是可以用显微镜观察的

If you have difficulty discerning star colors with the unaided eye, try looking at these stars with binoculars.

如果你觉得用肉眼观察星星颜色有困难的话，试着用望远镜观察它们。

This invisible protection, which rendered their own action unavailing,both irritated and piqued the engineer.

居民们在这种肉眼看不见的保佑下面，自己的行动显得一点用处也没有，赛勒斯·史密斯不禁感到又烦恼又着急。

The higher the sun rose, the higher rose the cloud of dust, and through the fine, burning dust the sun in the cloudless sky looked like a purple ball, at which one could gaze with undazzled eyes.

太阳升得愈高，尘土的云雾也升腾得愈高，但透过稀薄灼热的尘雾，那未被彩云遮盖的太阳仍然可用肉眼瞭望。

A vast amount of something - nearly six times the mass of visible matter - is unobservable.

大量的某种物质--大约是可见物质的6倍那么多吧--是我们以肉眼所无法观测到的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。