因为它们发生得太快，人的肉眼无法观察到，只能通过仪器才能观测到。
Because they occur too fast to be seen with eyes, they can be detected only by instruments.
普朗克探测到的光波-低频范围从30 - 857千赫-是我们肉眼无法观察到的。
Planck detects light that we can't see with our eyes — light with low frequencies ranging from 30 to 857 gigahertz.
英国过敏症研究专家警告说，在室内，到处充满了只有用显微镜才能观察到的发霉的过敏原，而这些过敏原是无法用肉眼识别的。
Everywhere in the house there will be microscopic mould allergens, unable to be seen by the naked eye, warn the experts at Allergy UK.
英国过敏症研究专家警告说，在室内，到处充满了只有用显微镜才能观察到的发霉的过敏原，而这些过敏原是无法用肉眼识别的。
Everywhere in the house there will be microscopic mould allergens, unable to be seen by the naked eye, warn the experts at Allergy UK.
应用推荐