naked eye

基本解釋

But all bubbles are identifiable, and the process described in the paragraph above is not invisible to the naked eye.
不過，所有泡沫都是可以辨認的，即使僅憑肉眼也能觀察到上文中所描述的過程。
If such a collision were real, "astronomers would have been tracking it for at least the past decade, and it would be visible by now to the naked eye, " it added.
如果真的存在這樣的行星，天文學家至少十年前就應該開始跟蹤觀察了。還有如果真的存在，現(xiàn)在肉眼應該可以看見了。
Currently this star is too faint to be visible with the naked eye, but over the next few months it will start climbing in brightness until it becomes one of the brightest stars in this constellation.
通常這顆恒星亮度非常微弱，因而不能用肉眼直接觀察到，但是在接下來的幾個月中，它的亮度將不斷攀升，直到成為鯨魚座中最明亮的恒星之一。

Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, iron, why is Mars red?
水銀是液態(tài)金屬，水銀，行星，是肉眼能看到的運動最快的天體,火星，鐵，為什么火星是紅色的？
麻省理工公開課 - 固態(tài)化學導論課程節(jié)選
What appears to the naked eye to be just glowing is actually superposition of different lines of distinct frequency. So, you see, this is quantized.
出現(xiàn)在肉眼面前的光亮,事實上是波段不同的光線的疊加,所以，它是量子化的。
麻省理工公開課 - 固態(tài)化學導論課程節(jié)選

The samples revealed "no-see-um" gold, invisible to the naked eye but detectable via assay.
FORBES: Virtual Gold
The Toyota Camry and its hybrid counterpart are essentially identical to the naked eye.
FORBES: Hefty Batteries Make Hybrids Safer, Study Finds