cm

IPA/sˌiːˈɛm/
IPA/sˌiːˈɛm/

cm — noun

1. a metric unit for measuring short lengths and small distances; one metre split i

1.名詞A2
釋義

a metric unit for measuring short lengths and small distances; one metre split into one hundred equal pieces gives one centimetre.

例句

Evelyn measured the table and found it was 120 cm wide.

often used after numbers to describe size

The tiny beetle that Saira found in the garden was only about 2 cm long.

同義詞
  • centimetre

    the full written form; cm is the standard abbreviation

文法句型

[number] + cm + [adjective]

用法筆記

This is the standard way to indicate short lengths in Taiwan and most countries. A centimetre is roughly the width of an adult fingernail.

常見錯誤

❌The table is 120 cm' (missing an adjective).
✅The table is 120 cm wide.
💡cm needs a dimension word like long, wide, or tall after it in a complete sentence.
❌I need 5 cm of string' (when you mean the string is 5 cm long).
✅I need a piece of string that is 5 cm long.
💡cm states a dimension, not an amount.

2. the chemical symbol for curium, a radioactive metallic element produced artifici

2.名詞C1
釋義

the chemical symbol for curium, a radioactive metallic element produced artificially in nuclear reactors and used in scientific research; the symbol uses a capital C — written as Cm, not cm.

例句

The periodic table shows Cm for curium, which is element 96.

Cm in the periodic table — capital C

Eleni analysed the sediment sample and found trace amounts of Cm present.

同義詞
  • curium

    the full element name; Cm is the symbol used in tables and chemical formulas

文法句型

Cm + verb (element symbol used as a noun in scientific writing)

用法筆記

Key difference: the length unit is cm (all lowercase), while the element symbol is Cm (capital C, lowercase m). In scientific writing, the full name curium is preferred in the main text; Cm appears in formulas and tables.

常見錯誤

❌The sample contained 5 cm of curium.' (lowercase cm suggests centimetres).
✅The sample contained 5 g of curium (Cm).
💡use capital C for the element symbol to avoid confusion with the length unit.

cm — abbreviation