例文・使い方で印象づける「doubles」の覚え方
スポンサーリンク...The train winds and doubles on itself up the gentle slopes and across the imperceptibly rising plains... 
Stewart Edward White 「African Camp Fires」
...If the possessor, through his labor, discovers some method of making it produce enough for two days, he doubles its value...
P. J. Proudhon 「What is Property?」
...δ and ζ are doubles for an opera-glass...
William Tyler Olcott 「A Field Book of the Stars」
...Two pleasing little doubles are Σ 2101, magnitudes sixand nine, distance 4", p...
Garrett Serviss 「Pleasures of the telescope」
... “Next—for, as you say, my presence doubles the danger—we will contrive to withdraw quietly from England...
Marcus Clarke 「For the Term of His Natural Life」
...The stars τ and ζ are doubles...
William Tyler Olcott 「A Field Book of the Stars」
...By aningenious optical contrivance it is possible to place the spectra fromthe two limbs side by side, which doubles the apparent displacement, andthus makes it much more easy to measure...
Robert Stawell Ball 「The Story of the Heavens」
...Other doubles are: 44 (Σ 1909), magnitudes five andsix, distance 4...
Garrett Serviss 「Pleasures of the telescope」
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