• prep. 按照（表示方式）；從事于；在…之內
• adv. 進入；當選；（服裝等）時髦；在屋里
• adj. 在里面的；時髦的
• n. 執(zhí)政者；門路；知情者
• n. (In)人名；(中)演(廣東話·威妥瑪)；(柬)殷(用于名字第一節(jié))， 因；(日)寅 (名)

來自古英語in,里面，上面，中間，進入，來自PIE*en,進入。詞義上面已由on替代。

in

in: [OE] In is a widespread preposition amongst the Indo-European languages. Greek had en, Latin in (whence French and Italian en and Spanish in), and amongst modern languages German and Dutch have in, Swedish i, Welsh yn, and Russian v, all of which point back to an original Indo-European *en or *n. The adverb in was not originally the same word; it comes from a conflation of two Old English adverbs, inn and inne, both ultimately related to the preposition in. (An inn is etymologically a place ‘in’ which people live or stay.)
=> inn

in

Old English in (prep.) "in, into, upon, on, at, among; about, during;" inne (adv.) "within, inside," from Proto-Germanic *in (cognates: Old Frisian, Dutch, German, Gothic in, Old Norse i), from PIE *en "in" (cognates: Greek en, Latin in "in, into," Old Irish in, Welsh yn-, Old Church Slavonic on-). As an adjective from 1590s.

The forms merged in Middle English. Modern sense distinction between in and on is from later Middle English. Sense of "holding power" (the in party) first recorded c. 1600; that of "exclusive" (the in-crowd, an in-joke) is from 1907 (in-group); that of "stylish, fashionable" (the in thing) is from 1960. The noun sense of "influence, access" (have an in with) first recorded 1929 in American English. In-and-out "copulation" is attested from 1610s.

1. No matter where you go in life or how old you get, there's always something new to learn about. After all, life is full of surprises.

不管你生活在哪里，你有多少歲，總有新東西要學習，畢竟，生活總是充滿驚喜。

來自金山詞霸 每日一句

2. For what do we live, but to make sport for our neighbours, and laugh at them in our turn?

我們活著是為了什么？不就是給鄰居當笑柄，再反過來笑他們。

來自《傲慢與偏見》

3. If you're lonely when you're alone, you're in bad company.--Jean Paul Sartre

如果你獨處時感到寂寞，說明沒有把自己陪好。

來自金山詞霸 每日一句

4. The turning point in the process of growing up is when you discover the core of strength within you that survives all hurt.

當你從內心深處找到一種可以忍受一切痛苦的堅強力量時，你的成長歷程就會出現(xiàn)飛躍。

來自金山詞霸 每日一句

5. They have maintained their optimism in the face of desolating subjugation.

面對遭征服的悲慘命運，他們保持了樂觀的態(tài)度。

來自柯林斯例句