| 单词 | frequency |
|---|---|
| 音标 | ['fri:kwənsi] |
| 解释 | n.频率 |
| 红宝书 | 【英】 n. 频率(rate of occurrence or repetition of sth) 【考】 frequency : pitch / wavelength : color(频率决定音高/波长 决定颜色)反义词：rarity(稀有 ) 【例】 Fatal accidents have decreased in frequency over recent years. |
| 字源 | frequency (n.) 1640s, "fact of occurring often," from Latin frequentia "a crowding, crowd," from frequentem (see frequent). Earlier it had been used in a now-obsolete sense of "state of being crowded" (mid-16c.); sense in physics, "rate of recurrence," especially of a vibration, is from 1831. In radio electronics, frequency modulation (1922, abbreviated F.M.) as a system of broadcasting is distinguished from amplitude modulation (or A.M.). |
| 不择手段背单词 | n. 频率(单位时间内某种完整波动的重复次数); 频繁性 【类】frequency: pitch = wavelength: color频率决定音高 = 波长决定颜色 【反】rarity(n 稀有) |
| 趣味全助记 | 无 |
Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.
Next card: Frequent middle french latin frequentem fri:kwənt v.时常来访；a.惯常的 英
Previous card: Frenzy contraction latin frenzi n.极度激动的状态，狂暴 英 n.极度激动的状态(st ate
Up to card list: 极品GRE红宝书(简体中文)