...All that dark earth heaved in mighty travail with the bursting bolls of the cotton while black attendant earth spirits swarmed above, sweating and crooning to its birth pains... 
W. E. B. Du Bois 「The Quest of the Silver Fleece」
...Its call is a crooning coo...
Frank M. Chapman 「What Bird is That?」
...He craved the Mistress's dear touch on his wound,and a word of crooning comfort from her soft voice...
Albert Payson Terhune 「Further Adventures of Lad」
...When she settles downto brood them she calls them with a peculiar crooning note...
John H. Robinson 「Our Domestic Birds」
...We could hear the birds crooning and cooing in alldirections as we rode, “like the moan of doves in immemorial elms,and the murmurings of innumerable bees...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
ランダム例文：
irrespective Giles repute
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