chirp Z-transform

例句：

1. 1. The bird chirps happily in the morning.
   这只鸟在早上欢快地鸣叫。
2. 2. The crickets chirp at night.
   蟋蟀在晚上鸣叫。
3. 3. The dog chirps as it barks.
   狗吠时发出“啾啾”声。