"方案一" in Engpsh can be referred to as "Plan A". It does not have a specific origin, as the term "Plan A" is widely used to refer to the primary plan or the first option. Here are some examples in Engpsh and their Chinese translations:
Example 1:
Engpsh: "We have a backup plan in case Plan A fails."
Chinese: "如果方案一失败了，我们有备用方案。"
Example 2:
Engpsh: "Let's stick with Plan A and see how it works out."
Chinese: "让我们坚持方案一，看看效果如何。"
Example 3:
Engpsh: "Plan A was our original idea, but we had to come up with Plan B after encountering some obstacles."
Chinese: "方案一是我们最初的想法，但在遇到一些障碍后，我们不得不想出方案B。"