C90

The next day, while I was sleeping, Li Shun called me with his cellphone: "Yi Ke, you grew up in Teng Chong in Yunnan, right?"

"Yes!" I answered groggily, not knowing what Li Shun meant.

"Does Teng Chong have an airport? Civil airport! " Li Shun said.

"Yes, Hump Airport, civilian!" "No," I said