n. the act of whistling a tune
n. 吹哨, 吹笛；鸣汽笛
1. The boy was whistling a cheerful tune as he walked to school.
男孩在上学的路上哼着愉快的旋律。
2. She often enjoys whistling while she cooks in the kitchen.
她在厨房做饭时常常喜欢吹口哨。
3. I heard someone whistling in the park during my afternoon walk.
我在下午散步时听到公园里有人在吹口哨。