with the naked eye

• adv. 用肉眼

with the naked eye的用法和样例：

例句

用作副词 (adv.)

1. You cannot look at the sun with the naked eye.
   你不能用肉眼直接观察太阳。
2. We can not see bacillus with eyes.
   我们不能用肉眼看到杆状菌。