名词
中文翻译：唱歌
同义词：
['sing', 'croak', 'whistle', 'hum', 'sing out', 'sing away']
例句：
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1. The bird coos softly to its chicks.
那只鸟轻声地对它的雏鸟鸣叫。
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2.The old man was singing a song he had learned in his youth.
那位老人正在唱他年轻时学会的歌曲。
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3. The baby is learning to coo and make noises.
婴儿正在学习发出声音和呜咽。