1. 号笛,鸣笛,汽笛：wheelbase轴距 | whistling号笛,鸣笛,汽笛 | winch绞车,绞盘

2. 鸣笛笛声：whistling buoy 响哨浮标 | whistling 鸣笛笛声 | white all-round light 白环照灯

3. 吹口哨：15 Tilting one's head(探头) | 16 Whistling(吹口哨) | 17 Twitching one's nose(皱鼻子)

4. 笛音：whistlerwave 电子回旋波 | whistling 笛音 | white 素 白 白的 白色 白色的

noun

1. the act of whistling a tune

e.g. his cheerful whistling indicated that he enjoyed his work

2. the act of signalling (e.g., summoning) by whistling or blowing a whistle

e.g. the whistle signalled the end of the game

Synonym: whistle

3. the sound made by something moving rapidly or by steam coming out of a small aperture

Synonym: whistle