extension [ɪk'stɛnʃən] 词频3 词根: ex

n. 伸展，扩大;延长，延期;[医]牵引;电话分机;

💡 exten=extend伸展；扩大+sion表名词 →延展，扩张；延期

"The toolshed was built as an extension of the house."

近义：wing, addition, annex, margin, augmentation, augmenting 反义：flection, flexure

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