fast的例句：She climbed the staircase cautiously，holding fast to the rail（她緊緊地抓著(zhù)欄桿，小心翼翼地爬樓梯）；Brindley was known as a very，very fast driver（眾所周知，布林德利是個(gè)喜歡飛車(chē)的人）。