毫米

• 拼音: háo mǐ
• 汉字拆解: 毫 = 高 (tall) variant + 毛 (hair) — something as fine as a hair, meaning tiny or one thousandth; 米 = pictograph of rice grains, borrowed for the metric unit 'metre'

含义

Millimetre. A unit of length equal to one thousandth of a metre, used for precise measurements.

Used in science, engineering, weather reports for rainfall, and everyday precise measurements. The prefix 毫 means 'one thousandth' and appears in other metric units like 毫升 (millilitre) and 毫克 (milligram). Common in technical and scientific contexts.

例句

1. 昨天的降雨量达到了五十毫米。
2. 这张纸的厚度只有零点一毫米。
3. 请用毫米来测量这条线的长度。

用法指南

语境: science, weather, measurement

语气: technical

正确说法

• 今天的降雨量是二十毫米。(Today's rainfall is twenty millimetres.)
• 这个零件的精度要求是零点五毫米。(The precision requirement for this part is 0.5 millimetres.)

错误说法

• 我家离学校有三毫米 (Don't use 毫米 for large distances — use 米 or 公里; 毫米 is only for tiny measurements)

起源与历史

毫 (háo, one thousandth/fine hair) + 米 (mǐ, metre) — one thousandth of a metre, following the metric prefix system.

文化背景

世代: All ages

社会背景: Universal