1
subject + slow(s) down
不及物用法，表示速度自发降低。
The car slowed down as it approached the intersection.
汽车在接近十字路口时慢了下来。
减速；放慢速度
先理解核心含义，再看它在真实句子里的用法。
减速；放慢速度
To become slower; to decelerate.
The car slowed down as it approached the intersection.
汽车在接近十字路口时慢了下来。
不及物用法，主语自身变慢
减速；放慢速度
To decelerate.
降低某物的速度或节奏
To reduce the velocity, speed, or tempo of something.
变得不那么强烈或热情,常含褒义,指摆脱过度或不必要的急切
To become less intense, enthusiastic, etc., usually with a positive connotation, implying that one is stripped of exaggerated or unnecessary eagerness.
slow down
Base
原形
slows down
3rd person
第三人称单数
slowing down
-ing
现在分词
slowed down
Past
过去式
slowed down
Past participle
过去分词
He always slows down when approaching a curve.
他接近弯道时总是减速。
The driver slowed down as he saw the red light.
司机看到红灯时减慢了速度。
The economy is slowing down this quarter.
本季度经济正在放缓。
规则变化，过去式和过去分词加-ed，现在分词去e加-ing。
The train slowed down as it approached the station.
火车进站时放慢了速度。
You should slow down and think before making a decision.
你应该放慢节奏，做决定前先想一想。
He is slowing down his speech so the students can understand.
他放慢语速，好让学生们听懂。
不及物用法，表示速度自发降低。
The car slowed down as it approached the intersection.
汽车在接近十字路口时慢了下来。
及物用法，宾语放在slow和down之间。
You need to slow the engine down before shifting gears.
换挡前你需要让发动机减速。
也可将宾语放在down之后，但不及前者常见。
The construction slowed down traffic on the highway.
施工使高速公路上的交通变慢。
祈使句，常用于提醒或警告。
Slow down! There's a sharp curve ahead.
慢点！前面有个急弯。
Not this
The government implemented a slow down of the economy.
Use this
The government implemented a slowdown of the economy.
“slow down” 是动词短语，不能用作名词。表示“减速”或“放缓”的名词形式是连写的 “slowdown”。
Not this
Please slow down your speed when driving in rain.
Use this
Please slow down when driving in rain.
“slow down” 已经包含“降低速度”的含义，不需要再加 “your speed”，否则语义重复。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use slow down naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
可及物或不及物。及物时宾语通常为事物或速度。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.