2. In triangle $ABC$, the altitudes $AA_{0}$, $BB_{0}$, and $CC_{0}$ are dropped. Let $H$ be the orthocenter. If $\overline{A H}: \overline{H A_{0}}=1: 1$ and $\overline{B H}: \overline{H B_{0}}=2: 1$, then what is the ratio $\overline{C H}: \overline{H C_{0}}$?