在完成一件任务之前不要去做下一件。

Don't move on to the next task until you're finished.

youdao

跑步并不是一件琐事，也不是一件任务。

It's not a chore or a task.

youdao

一件任务交给我，不管多么困难，我都要把它做好。

A task handed over to me, no matter how difficult, I will do it well.

youdao

She starts at the beginning of her day and goes through task after task, chore after chore, project after project

她从一天的开始说起，从一个任务说到另一个任务，从一件杂活说到另一件杂活，从一个项目说到另一个项目。

It sounds like 课堂 - SpeakingMax英语口语达人