all at once 同时;一起;突然;忽然

【例句】
All at once there was someone knocking on the door.
突然有人敲门。

All at once, Employment rate is also under the market economy the quality of higher education, Management of the evaluation index such as one of the important.
同时，毕业生的就业率也是市场经济条件下对高校教育质量、管理水平等方面重要的评价指标之一。