你冷靜下來，從頭開始跟我說。

Calm down and explain it from the beginning.

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 冷靜 lěngjìng
  1. calm; cool-headed; dispassionate
  2. (of a place) deserted; quiet
=3 下來 xiàlai
  1. to come down
  2. (completed action marker)
  3. (after verb of motion, indicates motion down and towards us, also fig.)
  4. (indicates continuation from the past towards us)
  5. to be harvested (of crops)
  6. to be over (of a period of time)
  7. to go among the masses (said of leaders)
=3 下來 xiàlái
  1. (used after a verb) down (toward oneself, or figuratively)
  2. down (toward oneself, or figuratively)
  3. to come down
4 從頭 cóngtóu
  1. anew
  2. from the start
5 開始 kāishǐ
  1. to begin
  2. beginning
  3. to start
  4. initial

classifier: 個
6 跟 gēn
  1. heel
  2. to follow closely
  3. to go with
  4. (of a woman) to marry sb
  5. with
  6. compared with
  7. to
  8. towards
  9. and (joining two nouns)
7 我說 wǒshuō
  1. I wondered that and now it makes sense that...
  2. Used other than figuratively or idiomatically: see 我, 說 /说.