..., tooth; como que echólos —s en, he was, as it were,born to (or into); eutre —s, between(my) teeth; cantar entre—s, to hum (a song)... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...There was a hum of approval from his comrades, an anxious stirring among the Spanish prisoners...
Rafael Sabatini 「Captain Blood」
...In the quietest parts of the forest there is heard a faint but distinct hum, which tells of insect joy...
David Livingstone 「Missionary Travels and Researches in South Africa」
...It is therefore not always easy to say how much of the hum is caused by wing vibration and how much by the action of the spiracles...
Edward Saunders 「Wild Bees, Wasps and Ants」
... He told of the lovely dragon flies, with purple, burnishedwings that floated in the forest, mingling their drowsy hum with thechirping of the birds...
Virginia Sharpe Patterson 「Dickey Downy」
...I saw him bend his eye down upon me, and I could hear the low hum of his plumage, as if the web off every quill in his great wings vibrated in his strong, level flight...
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
...Their loud, threatening hum has no sting to back it up, and their size and noise make them only the more conspicuous marks for the birds...
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
...Hard by the place of slaughter, in the greenbushes, a delicate ear perceives the hum of the Grasshoppers...
J. H. Fabre 「The Wonders of Instinct」
...Their busy hum makes an island of summersound in the midst of the silent ebbingtide of winter...
Rowland E. Robinson 「In New England Fields and Woods」
...The hum of insects fills the air with a drowsymurmur...
William J. Long 「Ways of Wood Folk」
...A drowsy hum of beesand flies seemed to distil, with warm aromatic scents, from thesun-steeped blooms and grass-tops...
Charles G. D. Roberts 「The Watchers of the Trails」
...As bees on flowers alighting cease their hum,So settling atSt...
Atticus 「Our Churches and Chapels」
...
Shakespeare has the same expression: “The hum of either army stillysounds”...
Alfred, Lord Tennyson 「The Early Poems of Alfred, Lord Tennyson」
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