1
the buttocks
复数形式泛指整个臀部。
She slipped and fell on the buttocks.
她滑倒了，摔到了屁股上。
船尾凸部
buttocks — plural of buttock
先理解核心含义，再看它在真实句子里的用法。
船尾凸部
The convexity of a ship behind, under the stern.
She slipped and fell on the buttocks.
她滑倒了，摔到了屁股上。
船尾下方的凸起部分
The convexity of a ship behind, under the stern.
He slipped and landed on his left buttock, bruising it badly.
他滑倒了，一屁股坐在左臀上，摔得青紫。
Squats are excellent for strengthening the buttocks and thighs.
深蹲对增强臀部和腿部肌肉非常有效。
The doctor asked the patient to expose his buttocks for the injection.
医生让病人露出臀部以便注射。
复数形式泛指整个臀部。
She slipped and fell on the buttocks.
她滑倒了，摔到了屁股上。
单数形式特指半边臀部。
He felt a sharp pain in the left buttock.
他感到左臀部一阵剧痛。
常用介词on表示部位。注射通常用单数，但口语中也用复数。
The nurse gave an injection on the buttock.
护士在屁股上打了一针。
Not this
He has a big buttock.
Use this
He has big buttocks.
在英语中，'buttock' 通常使用复数形式 'buttocks' 指代臀部，因为人体有两瓣臀部，即使是单数语境也多用复数。
Not this
I have pain in my buttock.
Use this
I have pain in my buttocks.
当泛指臀部疼痛时，英语习惯用复数 'buttocks'，即使可能只涉及一侧，复数更自然。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
船体纵剖线
The lines plan shows the buttock lines used to model the hull.
型线图显示了用于构建船体模型的船体纵剖线。
船体纵剖面
Each buttock plane cuts the hull vertically, parallel to the keel.
每个船体纵剖面都垂直地切割船体，与龙骨平行。
Use buttocks naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：船尾圆鼓鼓的凸出部分，像人的“butt”（屁股），所以 buttock 指“船尾凸部”。
语域：formal 常见场景：船舶工程、航海技术 该词条指船尾下方的曲面凸起，属于船舶工程领域的专业术语，通常多用于技术资料、文献或专业讨论中，日常口语里比较少见。
None of these words rhymes exactly with buttock /ˈbʌtək/, because the stressed vowel in buttock is /ʌ/ followed by /tək/. Haddock, paddock, and hammock are spelling lookalikes but have /æ/; hummock and stomach share the /ʌ/ vowel but differ in /m/ vs /t/; bullock has /ʊ/. So treat the spelling ending -ock with caution.
Dictionary facts from AI_FALLBACK, ECDICT, WIKTIONARY, WORDNET.