肉眼

With the naked eye only 6 of these 7 sister stars can be seen.

用肉眼只能看见7姐妹星中的6颗。

One is: The Great Wall of China is the only man-made object visible from space with the naked eye.

其中之一是：&在太空中肉眼唯一能看到的人造物是中国的长城。&

Bacteria are too small to see with the naked eye.

&细菌太小，肉眼看不见。&

These small insects can not see with the naked eye in the life of the local people are everywhere.

这些用肉眼看不到的微小昆虫，在人们生活的地方却无处不在。

You cannot look at the sun with the naked eye.

你不能用肉眼直接观察太阳。

Bacteria is too small to see with the naked eye .

细菌太小，肉眼看不见。

Scientific observation was limited to what could be seen with the naked eye.

科学研究也仅限于肉眼可见的东西。

Not all bacteria can be seen with the naked eye.

并非所有的细菌肉眼都能看得见。

Emissions to air, we almost do not see with the naked eye the blue sky.

地向空中排放废气，我们几乎用肉眼看不到蓝色的天空了。

So small is the diameter of the tube that it is hard to see it with the naked eye.

这根管子的直径太小了，用肉眼简直看不出来

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。