Dipyrrole
α, α'-联吡咯
🗣️ 情景例句
He's the best pediatrician in Westchester.
他是全Westchester最好的小儿科医师。
Poor health may be a bar to success in life.
健康不佳可能成为人一生中取得成功的障碍。
With experience, and with improved apparatus,
根据经验和改进了的仪器，