turn [tɝn] 词频1 词根: 扭转

vt.& vi. 使转动;旋转;使改变方向;使不适; vt. 使变酸;使变换;使变为; n. 翻转;（路线或方向的）改变;机会;

"The government did an about-turn over nuclear energy."

近义：loop, slew, swerve, veer, wind, bend 反义：reerect, right, straighten, unfold, untwist

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

back [bæk] 词频1

n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背; vt. 使后退;支持;加背书于;下赌注于; vi. 后退;倒退; adj. 背部的;后面的;以前的;拖欠的; adv. 以前;向后地;

"Water allotments to farmers were cut back in the drought."

近义：second, support, endorse, illustrate, document, backtrack 反义：impel, inch, save, loop, sheer, slew