usually ['juʒuəli] 词频1 词根: 使用

adv. 通常，经常，平常，惯常地;一直，向来;动不动，一般;素;

💡 usual通常的+ly副词后缀→通常地，惯常地

"The discovery of distillation is usually accredited to the Arabs of the 11th century."

近义：invariably, mostly, normally, oft, often, oftentimes 反义：infrequently, occasionally, seldom, sometimes

clock [klɑk] 词频1 词根: cl-

n. 钟，时钟;计时器;秒表;仪表; vt. 记录（时间或速度）;测…的速度; vi. 打卡;记下时间;

💡 cock(公鸡)+l:模仿公鸡的象声词，都是叫人起床- 钟表 闹钟（c）上锁（lock），不然乱闹

"I set the alarm clock for 7 o'clock."

近义：time, timepiece