This flashcard defines the English word "whistle", covering its usage as a noun (a sound made with the lips or by a bird, or the sound of wind) and a verb (to make a whistling sound or to make a loud, high-pitched sound, often as a signal).
这张卡片解释了英语单词“whistle”的含义，包括它作为名词（口哨、呼啸而过的声音）和动词（吹口哨、发出鸣笛声）的用法。
| Front | whistle |
|---|---|
| Back | n.口哨，呼啸而过 v.吹口哨，鸣笛声 |
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