爷爷在摇椅上轻声哼唱着老歌。
Grandpa ___crooned old songs softly in his rocking chair.
妈妈轻声哼着摇篮曲哄宝宝入睡。
The mother was ___crooning a lullaby to put the baby to sleep.
他温柔地哼唱着那首老歌。
He softly ___croons that old song.
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