微小

wēixiǎo
  1. minute (i.e. extremely small)
  2. infinitesimal

CEDICT

tiny; microscopic; minute; infinitesimal

Wiktionary

Examples

细菌微小到无法用肉眼看到。

Bacteria are so small that they cannot be seen with the naked eye.

Source: Tatoeba

宇航服保护宇航员们不会因和微小宇宙尘埃碰撞而受伤。

Spacesuits protect astronauts from being injured from impacts of small bits of space dust.

Source: Tatoeba

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