unseeable
例子
The microscopic organisms were unseeable without the aid of a powerful microscope.
没有强大的显微镜的帮助，那些微观生物是看不见的。
The subtle defects in the material were unseeable to the naked eye but detected through advanced imaging.
材料中的细微缺陷肉眼看不见，但通过先进的成像技术可以检测到。
