a period of time during which someone or something is tested
trial period的用法和样例:
例句
Still early in a one-year free trial period, vice principal Junko Tatsumi says results so far have been encouraging in Japan's long struggle with English language education. 这个教学办法仍在第一年的免费试用阶段,副校长巽纯子表示,在日本艰辛的英语教育环境中,目前的结果算是鼓舞人心的。