这个想法已经在他脑中存在了好久。

This idea has been in his mind for a long time now.

Source: Tatoeba

Sentence Composition

1 这个 zhège
  1. (pronoun) this
  2. (adjective) this
2 想法 xiǎngfǎ
  1. way of thinking; opinion; notion
  2. to think of a way (to do sth)
=3 已经 yǐjīng already
=3 已经 yǐjìng already
4 在 zài
  1. to exist; to be alive
  2. (of sb or sth) to be (located) at
  3. (used before a verb to indicate an action in progress)
5 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
6 脑 nǎo
  1. brain
  2. mind
  3. head
  4. essence
=7 中 Zhōng
  1. (bound form) China; Chinese
  2. surname Zhong
=7 中 zhōng
  1. within; among; in
  2. middle; center
  3. while (doing sth); during
  4. (dialect) OK; all right
=7 中 zhòng
  1. to hit (a target)
  2. to be struck by (a bullet, illness etc)
  3. to win (a prize or lottery)
8 存在 cúnzài
  1. to exist
  2. to be
  3. existence
=9 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=9 了 liǎo
  1. to finish
  2. (used with 得 dé or 不 bù after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as 無 wú or 不 bù) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of 瞭 liǎo)
=9 了 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=9 了 liào unofficial variant of 瞭 liào
10 好久 hǎojiǔ quite a while