层进式投注法简介：Hey! Is it Mr. Mu? I accidentally hung up the phone just now. I didn't mean to hang up on you. No, I just fixed the phone line and called you back quickly. Mr. Mu, you didn't blame me for this, right?
Hey! Is it Mr. Mu? I accidentally hung up the phone just now. I didn't mean to hang up on you. No, I just fixed the phone line and called you back quickly. Mr. Mu, you didn't blame me for this, right?
