...When looked at inthis objective way, human beings, and all associated terrestrialorganisms, appear only parenthetically in one of the subdivisions ofthe class of colloidal aggregates... 
Various 「Astounding Stories, August, 1931」
...For, parenthetically, even a single ray of this tropical sunlight is to the unprotected a very dangerous thing...
Stewart Edward White 「African Camp Fires」
...The heavenly bodies aresimply the greater light, the lesser light, and the stars—the lastbeing introduced quite parenthetically...
E. Walter Maunder 「The Astronomy of the Bible」
...It mayhere be added, parenthetically, that the occasionswill be very rare of there being 5 solar eclipsesin one year...
George Chambers 「The Story of Eclipses」
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