mmm

mmm — 縮寫

1. a written short form of 'micromillimeter' — a unit of length equal to one millio

1.縮寫C1
釋義

微毫米

百萬分之一公尺的長度單位

a written short form of 'micromillimeter' — a unit of length equal to one millionth (1/1,000,000) of a meter, used in science and engineering to describe very small distances, sizes, or gaps.

例句

The coating on the lens was only 200 mmm thick, invisible to the naked eye.

鏡片上的塗層只有 200 mmm 厚，肉眼看不見。

number + mmm + adjective complement

Niran measured the diameter of the fiber at 35 mmm using an electron microscope.

Niran 用電子顯微鏡測量到這根纖維的直徑為 35 mmm。

scientific measurement context

同義詞
  • µm

    the more common international symbol for micrometer/micron, equivalent to 1 mmm

  • micron

    an older term for the same unit; still used in some scientific fields

文法句型

number + mmm + (optional noun)

用法筆記

Always written in lowercase. Used almost exclusively in technical or scientific writing — you will rarely encounter 'mmm' in everyday speech or general media. Do not confuse with 'mm' (millimeter), which is 1,000 times larger.

常見錯誤

❌The screw was 5 mmm long.
✅The screw was 5 mm long.
💡a 5-micromillimeter screw would be far too small for everyday use; 'mm' (millimeter) is the correct unit for visible objects.