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propulsion system
propulsion 常直接修饰表示设备的名词，构成如 propulsion system、propulsion engine 等说法。
The new ferry uses a hybrid propulsion system.
这艘新渡轮使用混合动力推进系统。
推进；推动
propulsions — plural of propulsion
先理解核心含义，再看它在真实句子里的用法。
推进；推动
the act of propelling
The new ferry uses a hybrid propulsion system.
这艘新渡轮使用混合动力推进系统。
推进、驱动或推动的过程,通常向前或向前；推进力或冲量。
The process of propelling, driving, or pushing, typically forward or onward; a propulsive force or impulse.
推进物；起推进作用的东西。
That which propels.
The boat's propulsion comes from a small electric motor.
这艘船的推进力来自一个小型电动马达。
Engineers are testing a new system for the propulsion of the spacecraft.
工程师们正在测试一种用于航天器推进的新系统。
Strong propulsion helped the submarine move quickly through the water.
强大的推进力帮助潜艇在水中快速移动。
propulsion 常直接修饰表示设备的名词，构成如 propulsion system、propulsion engine 等说法。
The new ferry uses a hybrid propulsion system.
这艘新渡轮使用混合动力推进系统。
The engine provides propulsion for the boat.
发动机为这艘船提供推进力。
表达“推进方式或手段”时，常用 a means of propulsion 这一短语。
Oars are a simple means of propulsion for small boats.
桨是小船一种简单的推进方式。
Not this
The engine propulsions the boat.
Use this
The engine propels the boat.
propulsion 是名词，意为“推进；推进力”，不能作谓语动词；表达“推进”的动作应使用动词 propel，主语 The engine 为第三人称单数，故用 propels。
Not this
The propulsive of the rocket is very strong.
Use this
The propulsion of the rocket is very strong.
propulsive 是形容词，不能作主语；这里需要名词 propulsion 表示“推进力”，因此把 propulsive 改为 propulsion。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
喷气推进
The new fighter jet uses advanced jet propulsion.
新型战斗机使用先进的喷气推进。
火箭推进
Rocket propulsion is the only way to reach orbit.
火箭推进是进入轨道的唯一方式。
电力推进
The ferry runs on electric propulsion to reduce emissions.
这艘渡轮依靠电力推进以减少排放。
推进系统
The propulsion system of the ship was overhauled last month.
这艘船的推进系统上个月进行了大修。
核动力推进
Nuclear propulsion enables submarines to travel long distances without surfacing.
核动力推进使潜艇能够在水下长距离航行而无需上浮。
Use propulsions naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想火箭尾部喷出强气流，像一股脉冲把飞行器向前推——propulsion 就是“推进（力）”。
语域：formal 常见场景：航空航天工程、船舶技术、科技文献 propulsion 是较正式的科技用词，多用于工程、航天、船舶等领域，日常口语中较少见；医学中另指“慌张步态”。
All listed words end in a stressed /ʌlʃən/ (or /vʌlʃən/) and rhyme with propulsion. Watch out: 'pulse' /pʌls/, 'pulsar' /ˈpʌlsɑːr/, and 'compulsive' /kəmˈpʌlsɪv/ are lookalikes, but they end in /s/ or /sɪv/, not /ʃən/.
Dictionary facts from ECDICT, WIKTIONARY.