Hmm, I'll guess it was squeaky bicycle brakes.
嗯，我猜是自行车刹车发出的吱吱声。
Bicycle brake
原声例句
6 Minute English 六分钟英语
6 Minute English 六分钟英语
Is it: a) bicycle brakes squeaking, b) nails scraping a blackboard or, c) a baby crying?
a）自行车刹车的吱吱声，b）指甲刮黑板的声音，还是c）婴儿的哭声？
6 Minute English 六分钟英语
And you guessed it was bicycle brakes squeaking, which was… the wrong answer, I'm afraid, Phil.
你猜是自行车刹车的吱吱声，那恐怕是错误答案，菲尔。
英语百科
Bicycle brake
A bicycle brake reduces the speed of a bicycle or prevents it from moving. The three main types are: rim brakes, disc brakes, and drum brakes. There have been various types of brakes used throughout history, and several are still in use today.
Most bicycle brake systems consist of three main components: a mechanism for the rider to apply the brakes, such as brake levers or pedals; a mechanism for transmitting that signal, such as Bowden cables, hydraulic hoses, rods, or the bicycle chain; and the brake mechanism itself, a caliper or drum, to press two or more surfaces together in order to convert, via friction, kinetic energy of the bike and rider into thermal energy to be dissipated.
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