...Obscure rumblings were again beginning to shake the earth... 
Various 「Astounding Stories of Super-Science, May, 1930」
...The rumblings you have heard were not made entirely by our enemies...
Various 「Astounding Stories of Super-Science, October, 1930」
...The rumblings and cracklings overhead increased in intensity until theold house swayed and creaked with the concussions...
Harl Vincent 「Wanderer of Infinity」
...A few drops of rain fell; distant rumblings of thunderand flashes of lightning now cooled the air...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
...In the middle of the night, rumblings of thunder wereheard, and lightnings illuminated the glen...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
ランダム例文：
creaks scourge jauntiness
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