1、visible to the naked eye (especially of rocks).
肉眼可見的（尤其用于巖石）。

2、Unfortunately, with the naked eye it's hard to see exactly what makes them messy.
不幸的是，肉眼很難看出到底是什么攪亂了它們。

3、It becomes visible to the naked eye every 76 years when it nears the sun.
它每隔76年靠近太陽時，變得肉眼可見。

4、Many of the changes we can't see with the naked eye just looking at the testy itself.
這是暴躁。許多的改變，我們不能用肉眼看到的只是在尋找自己暴躁。