你得留意一下。

You must keep your eyes open.

Source: Tatoeba

Sentence Composition

=1 你 nǐ you (informal, as opposed to courteous 您 nín)
=1 你 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
=2 得 dé
  1. to obtain
  2. to get
  3. to gain
  4. to catch (a disease)
  5. proper
  6. suitable
  7. proud
  8. contented
  9. to allow
  10. to permit
  11. ready
  12. finished
=2 得 dè used in 得瑟 dèse
=2 得 de structural particle: used after a verb (or adjective as main verb), linking it to following phrase indicating effect, degree, possibility etc
=2 得 děi
  1. to have to
  2. must
  3. ought to
  4. to need to
3 留意 liúyì
  1. to be mindful
  2. to pay attention to
  3. to take note of
4 一下 yīxià
  1. (after a verb) a bit; a little (indicating brief duration, or softening the tone, or suggesting giving sth a try)
  2. all at once; suddenly