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[adj.] pectoral + noun
形容词 pectoral 通常放在名词前，常见搭配有 pectoral muscle（胸肌）、pectoral fin（胸鳍）。
He felt a sharp pain in his pectoral muscle after lifting weights.
举重后，他感到胸肌一阵剧痛。
胸的；胸部的
先理解核心含义，再看它在真实句子里的用法。
胸的；胸部的
of or relating to the chest or thorax
He felt a sharp pain in his pectoral muscle after lifting weights.
举重后，他感到胸肌一阵剧痛。
属于或关于胸部或胸膛的
Of or pertaining to the breast, or chest.
与胸部或肺部疾病相关的,或对其有益的
Relating to, or good for, diseases of the chest or lungs.
具有显眼颜色的胸部的
Having the breast conspicuously colored.
The physical therapist showed me exercises to strengthen my pectoral muscles.
物理治疗师给我示范了增强胸肌的锻炼动作。
He felt a sharp pain in his left pectoral area after lifting the heavy box.
他抬起重箱子后，感到左侧胸部一阵剧痛。
The doctor listened to her chest and noted that the pectoral region seemed tender.
医生听了她的胸部，并注意到胸部区域似乎有压痛。
形容词 pectoral 通常放在名词前，常见搭配有 pectoral muscle（胸肌）、pectoral fin（胸鳍）。
He felt a sharp pain in his pectoral muscle after lifting weights.
举重后，他感到胸肌一阵剧痛。
胸肌有左右两块，所以作名词表示胸肌时常用复数 pectorals。
She does bench presses to strengthen her pectorals.
她做杠铃卧推来加强胸肌。
此义指戴在胸前的装饰物（如主教佩戴的胸牌），与肌肉无关。
The bishop wore an ornate pectoral over his robe.
主教在长袍外佩戴了一件华丽的胸饰。
Not this
I feel sore in my pectoral after working out.
Use this
I feel sore in my pectorals after working out.
汉语的“胸肌”常用作整体概念，但英语中 pectoral 作名词时是可数肌肉，通常用复数 pectorals 指胸部肌肉群。因想要表达的就是两侧胸肌，所以必须用复数。
Not this
I have pectoral pain.
Use this
I have chest pain.
“胸痛”的常见英语表达是 chest pain，pectoral 虽然也是“胸的”形容词，但在日常和医学语境中多作解剖修饰语（如 pectoral muscle），用于描述疼痛并不自然。用名词 chest 作定语才符合英语习惯。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
胸肌
He felt a sharp pain in his pectoral muscle.
他感到胸肌一阵剧痛。
胸鳍
Pectoral fins help fish turn and stay balanced.
胸鳍帮助鱼类转向和保持平衡。
肩带
The pectoral girdle connects the upper limbs to the skeleton.
肩带将上肢与骨骼相连。
胸佩十字架
The bishop wore a silver pectoral cross.
主教佩戴着一枚银质胸佩十字架。
胸部区域
The doctor noticed swelling in the pectoral region.
医生注意到胸部区域有肿胀。
Use pectoral naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 pectoral 拆成 pec + toral：pec 是胸肌的英文昵称，toral 像‘托拉’（健身拉力），练胸肌时托拉杠铃——胸的、胸肌、胸饰都记它。
语域：mixed 常见场景：anatomy、gym/fitness、historical costume 作形容词时（胸部的）多用于医学或解剖学描述，较正式；作名词指胸肌（pectorals）时，常见于健身或口语，且常缩略为‘pecs’；指胸饰时则较生僻，多出现在历史或宗教服饰语境。总体正式度随用法变化。
作名词指胸肌时常用复数形式（the pectorals）。
Dictionary facts from ECDICT, WIKTIONARY.