millimeter

millimeter — noun

1. a metric unit for measuring very short lengths or small distances. One millimete

1.名詞A2
釋義

a metric unit for measuring very short lengths or small distances. One millimeter equals exactly 1/1000 of a meter — it is about as thick as a coin or a fingernail.

例句

A two-millimeter crack in the glass did not stop us from using the cup.

hyphenated compound: numeral + millimeter + noun (crack)

Charlotte measured the wooden plank carefully, cutting each end to exactly five millimeters thick.

同義詞
  • mm

    standard written symbol; used on rulers, maps, and in technical writing instead of the full word

文法句型

number + millimeter(s) + dimension adjective (wide, thick, long, deep)

number + millimeter(s) + in + dimension noun (length, width, thickness)

用法筆記

Frequently placed after a number and before an adjective of dimension (wide, thick, long, deep, high). The plural form millimeters is used with numbers greater than one: 1 millimeter but 3 millimeters.

常見錯誤

❌My pencil is 15 millimeters long.
✅My pencil is 15 centimeters long (150 millimeters).
💡A pencil is about 15 cm; mm is for tiny measurements like the pencil's diameter.
❌The metal is 2 millimeter thick.
✅The metal is 2 millimeters thick.
💡After any number greater than one, the unit must be plural.