title>ラッセル英単語・熟語:A-51 ( at will 意のままに ) - バートランド・ラッセルのページ
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at will [意のままに,自分の思うままに]
The study of heredity may in time make eugenics an exact science, and perhaps we shall in a later age be able to determine at will the sex of our children. This would probably lead to an excess of males, involving a complete change in family institutions.
* eugenics : 優生学
 出典:Bertrand Russell: Icarus, or, the Future of Science, 1924, Introductory]

You may go or stay at will.

wander at will through the country side
 出典:Shogakukan Random House English-Japanese Dictionary, 1982 ed.]

They were able to come and go at will.
[ 出典:Oxford Advanced Learner's Dictionary, 8th ed.]