• n. 三，三个
• num. 三
• adj. 三的，三个的

来自古英语 thri,三，来自 Proto-Germanic*thriz,三，来自 PIE*treyes,三，来自 PIE*trei,三，词 源同 thrice,tertiary.-es,表复数。

three

three: [OE] Three goes back to a prehistoric Indo- European *trejes, which also produced Greek treis, Latin trēs, Russian tri, Sanskrit tráyas, etc. Its Germanic descendant was *thrijiz, which has evolved into German drei, Dutch drie, Swedish and Danish tre, and English three. Amongst three’s many relations in English are treble, trellis [14] (etymologically something made from ‘three threads’), trinity, trio [18], triple, tripod [17] (etymologically something with ‘three feet’), trivial and possibly also travail and tribe.
=> drill, testament, third, travail, treble, trellis, tribe, trinity, trio, triple, tripod, trivet, trivial

three (adj.)

Old English þreo, fem. and neuter (masc. þri, þrie), from Proto-Germanic *thrijiz (cognates: Old Saxon thria, Old Frisian thre, Middle Dutch and Dutch drie, Old High German dri, German drei, Old Norse þrir, Danish tre), from nominative plural of PIE root *trei- "three" (cognates: Sanskrit trayas, Avestan thri, Greek treis, Latin tres, Lithuanian trys, Old Church Slavonic trye, Irish and Welsh tri "three").

3-D first attested 1952, abbreviation of three-dimensional (1878). Three-piece suit is recorded from 1909. Three cheers for ______ is recorded from 1751. Three-martini lunch is attested from 1972. Three-ring circus first recorded 1898. Three-sixty "complete turnaround" is from 1927, originally among aviators, in reference to the number of degrees in a full circle. Three musketeers translates French les trois mousquetaires, title of the 1844 novel by Alexandre Dumas père.

1. Three plus six makes nine.

3加6等于9.(注意,此句中的plus是 介词,plussix是介词短语,作three的 定语,因此,动词用makes, 不用make ) .

来自《用法词典》

2. Three hundred million dollars will be nothing like enough.

3亿美元远远不够。

来自柯林斯例句

3. After a three-weekend courtship, Pamela accepted Randolph's proposal of marriage.

经过3个周末的追求之后，帕梅拉接受了伦道夫的求婚。

来自柯林斯例句

4. Three prisoners were sharing one small cell 3 metres by 2 metres.

3个囚犯关在一个3米长2米宽的小牢房里。

来自柯林斯例句

5. The three parties will meet next month to work out remaining differences.

三方将在下个月会面，以解决余下的分歧。

来自柯林斯例句