precious

Compared meaning: valuable, deserving effort or care (adjective).

比较义项：有价值的，值得珍视或值得付出的（形容词）。

• worthwhile

  Emphasizes that the time, effort, or money spent is justified by the outcome; rarely used to state a specific monetary amount.

  强调所花的时间、精力或金钱换来的结果是值得的；很少用来说明具体的金钱数额。

  Working overtime today was worthwhile because we finished the whole project.

  今天加班是值得的，因为我们完成了整个项目。

• worth

  Must be followed by a price, amount, or gerund (worth ten dollars, worth trying); cannot stand directly before a noun the way the others can.

  后面必须跟具体价格、数量或动名词（worth ten dollars，worth trying），不能像其他词一样直接放在名词前作定语（不能说a worth book）。

  This antique clock is worth thousands of dollars today.

  这座古董钟如今价值数千美元。

• precious 本词

  Highlights sentimental, rare, or irreplaceable value rather than price; often used for family items, time, or memories.

  强调因情感、稀有或不可替代而显得珍贵，而不是强调金钱价格；常用于家族物品、时间或回忆。

  The photograph is precious to me because it's the only one of my grandfather.

  这张照片对我来说很珍贵，因为它是我祖父唯一的一张照片。

• valuable

  Focuses on how much something is worth in money or usefulness; freely modifies nouns like 'valuable advice' or 'valuable painting'.

  强调金钱价值或实用价值有多高；可以自由地修饰名词，如valuable advice（宝贵的建议）或valuable painting（贵重的画作）。

  The company's client list is a valuable asset for future sales.

  这家公司的客户名单是未来销售的宝贵资产。

Worthwhile, worth, precious, and valuable describe value. Worthwhile means effort or time spent is justified by the result. Worth needs a price or gerund after it, like worth trying, unlike the others. Precious means emotionally valuable, like family items. Valuable means worth money or useful.

这四个词都表示“有价值”，但侧重点不同：worthwhile强调付出的时间和精力换来的结果值得；worth后面必须接具体价格或动名词，语法上不能直接修饰名词；precious强调情感上或因稀有而珍贵；valuable强调金钱或实用价值高。这里不比较worth作名词时表示“财产、资产”的用法（如net worth净资产）。

Compared meaning: much loved or especially liked (adjective).

比较义项：钟爱的，特别喜爱的（形容词）。

• precious 本词

  Describes something cherished for deep emotional or sentimental value, often irreplaceable; typically modifies objects, memories or people and can also be used predicatively.

  形容因深厚的情感或纪念意义而被珍视的事物，往往独一无二、无法替代；通常修饰物品、回忆或人，也可作表语。

  Her late mother's necklace is precious to her, though it isn't worth much money.

  她已故母亲留下的项链对她来说很precious，尽管它并不值多少钱。

• pet

  Almost always placed before a noun in fixed expressions like 'pet project' or 'pet theory', showing a personal, sometimes quirky favorite; rarely used predicatively.

  几乎总是放在名词前，用于“pet project”（钟爱的项目）、“pet theory”（偏爱的理论）等固定搭配，表示个人特别偏爱、略带随意的喜好；这个意义上很少作表语。

  Cutting the team's paperwork in half has become her pet project this year.

  今年，把团队的文书工作减少一半成了她的pet项目，也就是她特别偏爱、上心的项目。

• dear

  Expresses warm affection, especially toward people; common in letter or email openings such as 'Dear Sir' and phrases like 'my dear friend'; softer and more intimate than the others.

  表达温暖的情感，尤其用于对人的称呼；常见于书信或邮件开头，如“Dear Sir”（亲爱的先生），也用于“my dear friend”（我亲爱的朋友）之类的说法；比其他几个词更柔和、更亲密。

  She began the letter, 'Dear Grandma, I think about you every single day.'

  她在信的开头写道：“Dear 奶奶，我每天都想着你。”

• favorite

  Implies choosing one thing as the most liked among several alternatives; neutral in tone and combines freely with everyday nouns like food, color or song.

  暗示在多个选项中挑出最喜欢的一个；语气中性，可自由搭配食物、颜色、歌曲等日常名词。

  Chocolate ice cream has always been his favorite dessert on hot summer days.

  巧克力冰淇淋一直是他在炎热夏日里的favorite甜品。

These four words mean deeply loved. Precious: cherished for emotional value. Pet: used before a noun, as in pet project. Dear: warm affection, as in letters. Favorite: liked best among choices. This excludes precious (costly), pet (an animal), dear (expensive), and favorite (a noun).

这四个词都可表示“深受喜爱的”，但语气和用法差别很大：precious强调因情感或纪念意义而倍加珍视，多修饰物品、回忆或人；pet几乎只用在project、theory等名词前的固定搭配里，表示个人特别偏爱、略带随意的喜好；dear侧重对人的温暖情感，常用于书信称呼；favorite则是在多个选项中挑出最喜欢的一个，语气中性。这里不比较precious表示“贵重的，稀有的”的义项、pet作名词“宠物”的用法、dear在英式英语中“昂贵的”的义项，以及favorite作名词“最喜爱的人或物”的用法。