"Start from zero" | 从零开始

start from scratch/zero从头开始

to begin doing a job or activity completely from the beginning

•There were no textbooks, so the teachers↗ had to start from scratch. ↘

没有课本，因此教师们只得从零开始。

be back where you started前功尽弃；白费劲

to try to do something and fail, so that you finish in the same situation that you were in before

•A lot of people↗ who lose weight / gain it back over time, and end up back / where they started. ↘

许多人减肥后经过一段时间体重又恢复到以前的水平，最后是前功尽弃

start afresh/anew 重新开始

to stop doing what you are doing and begin doing it again in a better or different way

•She saw her new job↗/ as a chance to start afresh. ↘

她把自己的新工作视为重新开始的一次机会。