但願

但愿
dànyuàn
  1. if only (sth were possible)
  2. I wish (that)

CEDICT

Entry Composition

1 但 dàn
  1. but; yet; however; still
  2. merely; only; just
2 願 yuàn
  1. (bound form) wish; hope; desire
  2. to be willing
  3. to wish (that sth may happen); may ...
  4. vow; pledge