whistling
n. 吹哨，吹笛；鸣汽笛
adj. 发出哨声的；听起来像哨声的
v. 鸣汽笛（whistle 的 ing 形式）
例句
He set off jauntily, whistling to himself.
他吹着口哨神气活现地出发了。
《牛津词典》
He was whistling softly to himself.
他自娱自乐地轻声吹着口哨。
《柯林斯英汉双解大词典》
The wind was whistling through the building.
风呼啸着穿过那座大楼。
