湯姆，你要冷靜一點。

Tom, you need to calm down.

Source: Tatoeba

Sentence Composition

1 湯姆 Tāngmǔ Tom (name)
=2 你 nǐ you (informal, as opposed to courteous 您 nín)
=2 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.)
=3 要 yāo (bound form) to demand; to coerce
=3 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important
=3 要 yǎo
  1. (archaic) alternative form of 偠 (yǎo)
  2. alternative form of 偠 (yǎo)
  3. used in 要褭／要袅
4 冷靜 lěngjìng
  1. calm; cool-headed; dispassionate
  2. (of a place) deserted; quiet
5 一點 yīdiǎn
  1. a bit; a little bit
  2. (used in negative expressions) (not) the least bit
  3. (after an adjective, used to form the comparative) a bit more, -er
  4. a point (in a discussion etc)
  5. (calligraphy) dot stroke (、)
  6. one o'clock (abbr. for 一點鍾 yīdiǎnzhōng)