1
bite one's fingernails
咬手指甲表示紧张或焦虑的习惯，常用复数。
She bites her fingernails when she is worried.
她担心时咬手指甲。
手指甲
先理解核心含义，再看它在真实句子里的用法。
手指甲
the nail at the end of a finger
She bites her fingernails when she is worried.
她担心时咬手指甲。
手指尖端附近坚硬、扁平、半透明的覆盖物,用于搔抓和精细操作。
The hard, flat translucent covering near the tip of a human finger, useful for scratching and fine manipulation.
手指末端的指甲
the nail at the end of a finger
She painted her fingernails bright red for the party.
她为派对把指甲涂成了亮红色。
He accidentally cut his fingernail too short while trimming it.
他修剪时不小心把手指甲剪得太短了。
Dirt often gets trapped under the fingernail if you garden without gloves.
不戴手套做园艺时，污垢常常会卡在手指甲下面。
咬手指甲表示紧张或焦虑的习惯，常用复数。
She bites her fingernails when she is worried.
她担心时咬手指甲。
用 have 描述手指甲的外观时，常用复数形式。
The pianist has long, clean fingernails.
那位钢琴家有长而干净的手指甲。
Not this
I need to cut my fingernail.
Use this
I need to cut my fingernails.
汉语名词没有复数变化，学习者常忽略英语可数名词的复数。fingernail 是可数名词，泛指双手所有指甲时应用复数 fingernails。
Not this
My fingernails hurt after the long walk.
Use this
My toenails hurt after the long walk.
fingernail 专指手指甲，脚趾甲是 toenail。走路导致疼痛的是脚趾甲，不能混用。
Not this
I broke my finger's nail.
Use this
I broke my fingernail.
英语中常用复合名词 fingernail 表示手指甲，而不用名词所有格 finger's nail，后者不自然且冗余。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
咬手指甲
He bites his fingernails when he is nervous.
他紧张时咬手指甲。
修剪手指甲
She trims her fingernails every Sunday.
她每个星期天修剪手指甲。
指甲钳
I need a pair of fingernail clippers.
我需要一把指甲钳。
脏手指甲
His dirty fingernails showed he had been gardening.
他脏兮兮的手指甲表明他一直在打理花园。
长手指甲
She keeps her fingernails long and polished.
她留着长手指甲并涂了指甲油。
像指甲刮黑板一样刺耳（形容声音或体验令人难受）
The squeaking of the door is like fingernails on a chalkboard.
门吱吱响的声音像指甲刮黑板一样刺耳。
勉强支撑；勉强维持
The company is still hanging on by its fingernails after losing so many customers.
在失去这么多客户后，这家公司仍在勉强支撑。
发长 /eɪ/ 音 (如 rain, wait)
Use fingernail naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 finger（手指）+ nail（指甲）：手指尖上的那片硬甲就是 fingernail。
语域：neutral 常见场景：日常对话、健康与美容护理 fingernail 是中性词，正式与非正式场合都常用；日常指手指末端的指甲时，通常直接使用这个词，没有明显的修辞色彩。
fingernail /ˈfɪŋɡɝˌneɪl/ ends in /neɪl/. It rhymes with nail, sail, mail, tail and rail (all spelled -ail). Pale is spelled -ale but also rhymes. Beware lookalikes such as finger /ˈfɪŋɡər/ and fingering /ˈfɪŋɡərɪŋ/: they share the first part but do not rhyme with fingernail.
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.