"To do something according to plan" 可以用 "to stick to the plan" 或 "to follow the plan" 来表示。这个短语的来源是指按照预先设定的计划或方案去做事。

例句：

"We need to stick to the plan if we want to finish the project on time." (我们需要坚持计划，才能按时完成这个项目。)
"The team is following the plan and making progress." (团队正在按照计划进行并取得进展。)
"It's important to stick to the plan, even when things get difficult." (即使在困难的情况下，坚持计划也很重要。)