microscopic

Dust mites are microscopic insects that live in carpets and bedding.

(Chinese) 尘螨是生活在法毯和床上用品中的极小昆虫（肉眼看不见）。

Even a microscopic crack in the airplane's wing could lead to a serious accident.

(Chinese) 即使是飞机机翼上一个极小的裂纹也可能导致严重的事故。