【上位】 trying something to find out about it; "a sample for ten days free trial"; "a trial of progesterone failed to relieve the pain" 何かを試みて、そのことに関する情報を得る。
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【上位】 the act of testing something; "in the experimental trials the amount of carbon was measured separately"; "he called each flip of the coin a new trial" 何かをテストする行為。
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