你一定要好好記住。

You must bear it in mind.

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 一定要 yīdìngyào must
3 好好 hǎohǎo well; carefully; nicely; properly
=4 記住 jìzhu
  1. to remember
  2. to bear in mind
  3. to learn by heart
=4 記住 jìzhù to remember; to bear in mind; to memorize