...I wastherefore at different times unable to manage the canoe, for thepaddling was very laborious... 
Olaudah Equiano 「The Interesting Narrative of the Life of Olaudah Equiano, Or Gustavus Vassa, The African」
... The carrying on of these different objects, together with the writing which was connected with them, proved very laborious, and occupied almost all my time...
Thomas Clarkson 「The History of the Rise, Progress and Accomplishment of the」
...Europeans often pity the sex thus "doomed to perform the most laborious drudgery;" but it is a waste of sentiment...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...In this laborious work, I have collected many interesting facts which I shall share with my friends and the public as soon as I have leisure...
P. J. Proudhon 「What is Property?」
...Some ofthe ideas were obviously more impractical than those of Réaumur, but theexperimenters tried them out and sometimes succeeded in hatchingchickens by very peculiar and laborious processes...
John H. Robinson 「Our Domestic Birds」
... Doubtless the man really believed that but for the laborious days that bird-catchers spend lying on the grass, the human race would be very badly off...
W. H. Hudson 「Birds in Town and Village」
...Its flight is slow and laborious, while it moves on the ground and intrees with a quickness and freedom equal to that of our better knownBluejay...
Various 「Birds Illustrated by Color Photograph [April, 1897]」
...From the richest he takes their superfluous wealth to distribute it among those whom misfortune, unmerited always in this laborious world, may have rendered necessitous...
Maurice Maeterlinck 「The Life of the Bee」
...The Bruchus knows neither the fatigues of the laborious, obliged tolimit the size of her family, nor the misfortunes of the parasite,obliged to produce an exaggerated number of offspring...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...The work is so laborious and the worker so feeble! I cannot tell how long it is since my bantlings attained their object...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...On the contrary, the parasite leads a laborious life, harder than that of the worker...
J. Henri Fabre Alexander Teixeira de Mattos 「The Mason-bees」
...The efforts of the most laborious of lives have ended in this lamentable relic...
J. Henri Fabre Alexander Teixeira de Mattos 「The Mason-bees」
...I repeat my laborious expedition to the Bois des Issards over and over again; and each time I see the males as assiduous as ever in skimming over the ground...
J. Henri Fabre 「More Hunting Wasps」
...There is thus no fear that the contents of the cells may become mixed or transposed; and I am saved the trouble of keeping a laborious watch...
J. Henri Fabre 「Bramble-bees and Others」
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