Prateleira · ListeningFormal vs Informal Tone正式与非正式语体C1 Avançado · EnglishJoy Studio · C1EpisodesSame Message Two Ways — 同一意思两套说法Email Softening — 邮件语气Meeting Speak — 会议用语Casual Peer Talk — 同事闲聊Repairing Tone — 修正语气