一次 1.(一回) once 一周一次 once a week; 不止一次 more than once; 再一次 once again; 再试一次 try once again; 一次就够了吗? will once be enough? 雷声隔得一次比一次久, 这意味着暴风雨正在过去。 the increasing distance between thunderclaps meant the storm was moving away. 我到过那儿一次。 i have been there once. 我只见过他一次。 i've met her only once.2.[数学] linear3.[电学] primary