トライアル

(1)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"

(2)何かをテストする行為

(3)trying something to find out about it; "a sample for ten days free trial"; "a trial of progesterone failed to relieve the pain"

(4)何かを試みて、そのことに関する情報を得る

(1)