sub-visible
adjective specialized (also subvisible) uk/ˌsʌbˈvɪz.ə.bəl/ us/ˌsʌbˈvɪz.ə.bəl/
science （因为太小，不使用特殊设备无法看见）亚可见的
too small to be seen without special equipment
There are various methods for measuring sub-visible particles.
The subvisible flicker can cause headaches and eyestrain. 亚可见的闪烁会导致头痛和眼睛疲劳。
environment （云）亚可见的
(of clouds) too thin to be seen
Particles that occur in apparently cloudless air are known as sub-visible cirrus. 在明显无云的空气中出现的颗粒被称为亚可见卷云。
The cloud was subvisible to most observers.
- More examples
- Standing by a busy road, you breathe in a large number of sub-visible particulates.
- Subvisible particle formation in these drug products poses a risk.
- the sub-visible world of atoms and molecules
- The density of particles has an effect on whether the cirrus is visible or subvisible.
- We knew that sub-visible cirrus was there, so we measured it with the laser.
- A subvisible cloud could persist for about a day.