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projectiles (n.) + be + verb-ed + (prepositional phrase)
projectile 在此作名词，在被动句中作主语。
The projectiles were thrown at the target.
这些抛射物被投向了目标。
抛射物；发射体
先理解核心含义，再看它在真实句子里的用法。
抛射物；发射体
a weapon that is thrown or projected at a target and is not self-propelled
The projectiles were thrown at the target.
这些抛射物被投向了目标。
旨在或已经由武器发射的物体。
An object intended to be or having been shot from a weapon.
投射武器,非自推进的投掷物
a weapon that is forcibly thrown or projected at a targets but is not self-propelled
受外力(如强风)推动或抛向空间的物体。
Any object propelled or thrown through space by the application of a force, such as strong wind.
火箭发动机自推进的飞行器
any vehicle self-propelled by a rocket engine
The knight raised his shield to block the incoming projectile.
骑士举起盾牌挡住了飞来的抛射物。
During the siege, the defenders used catapults to launch projectiles at the enemy.
围城期间，守军使用投石机向敌人发射抛射物。
The training exercise showed soldiers how to identify the path of a projectile.
训练演习向士兵展示了如何识别抛射物的轨迹。
projectile 在此作名词，在被动句中作主语。
The projectiles were thrown at the target.
这些抛射物被投向了目标。
在 there be 句型中，名词用复数 projectiles。
There were projectiles in the air.
空气中有抛射物。
projectile 这里是形容词，意为「投射的／抛射的」，直接放在名词前作定语，如 projectile motion（抛体运动）。
The students studied projectile motion in their physics class.
学生们在物理课上学习了抛体运动。
Not this
The police fired several projectile at the protesters.
Use this
The police fired several projectiles at the protesters.
汉语名词没有复数变化，所以学习者常漏加复数词尾。projectile 是可数名词，受 several 修饰时必须用复数形式 projectiles。
Not this
The projecting motion of the ball can be calculated using physics.
Use this
The projectile motion of the ball can be calculated using physics.
在物理术语 projectile motion（抛体运动）中，projectile 是形容词，意为“抛射的”。学习者看到动词 project 后误用其分词形式 projecting，但标准搭配是 projectile motion。
Not this
The arrow was a project fired from the bow.
Use this
The arrow was a projectile fired from the bow.
project 意为“项目、工程”，与 projectile 拼写相近但意义不同。projectile 是名词，指被投掷或发射的物体，如箭、炮弹等。学习者常因熟悉 project 而误用它，但表示“投射物”必须用 projectile。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
发射抛射物
The experiment used an air cannon to launch a projectile.
实验用气炮发射了一个抛射物。
抛体运动
Physics students often study projectile motion.
物理专业的学生经常研究抛体运动。
投射武器
A crossbow is a type of projectile weapon.
弩是一种投射武器。
抛射物碎片
The surgeon removed a projectile fragment from his leg.
外科医生从他腿上取出一块抛射物碎片。
高速抛射体
The test measures how a high-velocity projectile affects the target.
该测试衡量高速抛射体对目标的影响。
Use projectile naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把project(投射)和-ile(物)联想：一块石头被向前投出，就是projectile（抛射物）。
语域：formal 常见场景：military、forensics、technical writing projectile（指抛射物、发射体）多用于军事、法医学或技术写作等正式、专业语境；日常口语中更常用 bullet、shell 或 object 等词。一般描述可用更中性的词，正式或技术性写作中使用 projectile 更自然。
只有 dialectal 真正押韵：/ˌdaɪəˈlɛktəl/ 与 /prəˈdʒɛktəl/ 的重读元音 /ɛ/ 及之后的 /ktəl/ 相同。其余都是拼写上的形似词：profile、exile、reptile、textile 中的 -ile 读 /aɪl/，missile 可读 /ˈmɪsəl/ 或 /ˈmɪsaɪl/，所以不要只按拼写判断 -ile 的读音。
Dictionary facts from ECDICT, WIKTIONARY.