eighty

The cardinal numeral representing the quantity of eighty units; the eightieth positive integer following seventy-nine; a composite number (2⁴×5); a round multiple of ten commonly used in counting, measurement, percentages, and age milestones. Also functions as a noun (denoting the symbol, quantity, or group of eighty), adjective/determiner (modifying nouns to indicate quantity), and pronoun (standing in for a plural noun phrase).

• 🇨🇳数词，表示八十，即八个十；可作基数词、序数词、名词或量词使用，指八十个事物、人或计数单位。

1. Cardinal numeral: the number 80 A1 formal

   Used to denote a quantity of eighty persons or things; the eightieth positive integer in the sequence of natural numbers; a composite number (2⁴×5); represents an eightyfold quantity in counting, mathematics, and everyday usage.

   • There are eighty columns in the classical temple.
   • She scored eighty points in the final exam.
   • Eighty plus eighty equals one hundred sixty.
   • The vehicle maintains a speed of eighty kilometers per hour.
   • He completed eighty pages of the manuscript this month.

   🇨🇳基数词：数字80

2. Noun: the number, symbol, or group of eighty A2 formal

   A noun referring to the cardinal number eighty; the numeral symbol 80 or LXXX; a set, collection, or group consisting of eighty items; a playing card displaying eighty (in extended decks); a team or ensemble of eighty members; in currency, an eighty-unit banknote.

   • The number eighty marks an oak anniversary milestone.
   • Circle the eighties in this financial dataset.
   • The symphony orchestra includes an eighty of musicians.
   • In some card variants, the eighty holds special scoring value.
   • The procurement register lists an eighty of approved suppliers.

   🇨🇳名词：数字、符号或八十个一组

3. Adjective/Determiner: amounting to eighty A1 formal

   Used attributively before a noun to indicate that the quantity or number of the noun is eighty; modifies plural countable nouns to specify exact quantity.

   • They booked an eighty-week doctoral research program.
   • We need eighty additional credentials for the summit.
   • The laboratory procedure requires eighty milliliters of the buffer solution.
   • She has eighty years of combined experience in the field.
   • Eighty international organizations endorsed the climate accord.

   🇨🇳数量词：八十的

4. Pronoun: eighty people or things (plural) B1 formal

   Used as a pronoun to refer to eighty previously mentioned or understood persons or things; takes plural verb agreement.

   • Eight hundred applied, but only eighty were selected for the scholarship.
   • I invited six hundred guests; eighty confirmed their attendance.
   • How many seats should we reserve? — Eighty will be ideal.
   • Several firms submitted bids, but eighty advanced to the contract negotiation stage.
   • Of the manuscripts evaluated, eighty were accepted for publication.

   🇨🇳代词：八十个人或事物

• eightieth ordinal