动词
中文翻译：发出声音
同义词：
['cry out', 'squeak', 'whistle']
例句：
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1. The bird is singing a beautiful song in the park.
那只鸟在公园里唱着一首美妙的歌曲。
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2. The old clock was whistling as it struck midnight.
旧钟在午夜敲响时发出了响声。
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3. She whistled a tune to get her dog's attention.
她吹了一声口哨来吸引她的狗。