怎么把uefi改为legacy:______ _____hours are there in a day?

______ _____hours are there in a day? ______ ______ are you? ______羊,______蛇,______牛, 数学______ 数学______ 佛烧一炷香，______ 视而不见,______ ______凿壁偷光 ______节 ______，不见森林。