在英语中，做主线任务可以用 "focus on the main task" 或 "work on the primary task" 来表达。例如：
It's important that we focus on the main task and not get sidetracked by other tasks.
I need to set aside some time to work on the primary task before I can tackle the smaller tasks.
也可以用 "complete the main objective" 或 "achieve the primary goal" 来表达。例如：
Our top priority is to complete the main objective of the project.
Let's make sure we are all working towards achieving the primary goal of the company.
希望这些表达能帮到你！
It's important that we focus on the main task and not get sidetracked by other tasks.
I need to set aside some time to work on the primary task before I can tackle the smaller tasks.
也可以用 "complete the main objective" 或 "achieve the primary goal" 来表达。例如：
Our top priority is to complete the main objective of the project.
Let's make sure we are all working towards achieving the primary goal of the company.
希望这些表达能帮到你！