try out   (TTS發音)

test； use during a trial period試驗；試用

    The new kind of engine must be tried out before they are sold. 新型發動機在銷售之前一定要進行試驗。

    They let me try out the sewing machine for several days before buying. 他們讓我先試用幾天這台縫紉機再買。