1, clear and melodious: to describe whistle, clear and melodious is a very appropriate word. It conveys the clear and transparent characteristics of whistle, and emphasizes the melodious whistle, which means that the sound travels far and has rich timbre.
2, high-pitched and passionate: when describing the whistle, high-pitched and passionate is a suitable word. It conveys the characteristics of excitement and excitement of the whistle, which reminds people of the scene of going forward bravely.