例文・使い方で印象づける「optional」の覚え方
スポンサーリンク...This is not optional... 
Various 「Ainslee's magazine, Volume 16, No. 3, October, 1905」
... The sex of the egg is optional...
J. Henri Fabre 「Bramble-bees and Others」
... The question remains how this optional assessment of the sexes is effected...
J. Henri Fabre 「Bramble-bees and Others」
...Thus the sex of the egg is optional...
J. H. Fabre 「The Wonders of Instinct」
...The question remains how this optional assessment of the sexes iseffected...
J. H. Fabre 「The Wonders of Instinct」
...As the bird now lies, it is optional whether the flesh iscleaned away from the root of the tail first or from the legs andwings...
Montagu Browne 「Practical Taxidermy」
...Whether in formal or aerial chiaroscuro, it is optional withthe student to make the local colour of objects a part of his shadow, orto consider the high lights of every colour as white...
John Ruskin 「Lectures on Art」
...If the time were made optional, grasping men would put it offtill the end of the year, and sooner or later that would be the generalrule...
E. Walter Maunder 「The Astronomy of the Bible」
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afflicted caning rewards
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