unknown [,ʌn'non] 词频1

adj. 未知的;不出名的;从未发生的;从不存在的; n. 不知名或不出名的人;未知的事物;<数>未知数;未知数;

💡 un不+known已知的→不知道的；未知的

"The authorship of the poem is unknown."

近义：mystery, puzzle, puzzler, secret, enigma, ignored 反义：noted, reputable, reputed, acknowledged, familiar

number ['nʌmbɚ] 词频1 词根: number

n. 数字;数量;号码;编号; v. 标号;总计;把…算作;

💡 numer, number 表示”数字”;”计算”,”估算”

"The number of people employed in agriculture has fallen in the last decade."

近义：numerate, reckon, recount, sum, tally, cipher 反义：remove, subduct, take, withdraw, deduct

letter ['lɛtɚ] 词频1 词根: 文字

n. 信;证书，许可证;字母，文字;字面意义; vt. 用字母标明;写字母于;加标题; vi. 写印刷体字母;

"a letter of accreditation"

近义：label, mark, docket, missive, note, epistle

stands

n. 看台；架子；货摊（stand的复数）

近义：bleachers, grandstand