空中

kōngzhōng
  1. in the sky
  2. in the air

CEDICT

Entry Composition

1 空 kōng
  1. empty
  2. air
  3. sky
  4. in vain
2 中 zhōng
  1. within; among; in
  2. middle; center
  3. while (doing sth); during
  4. (dialect) OK; all right