二選一。

Choose one of the two.

Source: Tatoeba

Sentence Composition

1 二 èr
  1. two
  2. 2
  3. (Beijing dialect) stupid
2 選 xuǎn
  1. to choose
  2. to pick
  3. to select
  4. to elect
3 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit