drawing board

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That is because, unlike an engineer, evolution cannot go back to the drawing board, it can merely play with what already exists.
这是因为，与工程师不同，生物进化无法退回到最初阶段（重新来过），只能在现有的“设计图”上进行改进。
If your investment keeps underperforming compared to its counterparts, go back to the drawing board and find somewhere else to invest.
如果你的投资与其他同类投资相比一直表现不良，那就回到制图板前重新计划，找到新的投资方向。
In many cases, it has been "back to the drawing board" and calling in the highly paid specialists to help fix a problem that could have been easily avoided with some up-front diligence.
在许多情况下，不得不“重新回到制图板”，并且给费用高昂的专家打电话，寻求协助解决某个在项目早期稍微勤快一点就可以轻松避免的问题。

Then she went to Johnsy's room with her drawing board, whistling ragtime.
And so you have to go back to the drawing board and realize Bubble Sort or whatever it is you're using just isn't enough to snuff, I need to come up with something more clever.
因此，你必须重新开始,而且会意识到冒泡排序,或你正在使用的方法并不理想，我需要提出一种更好的方法。
哈佛公开课 - 计算机科学课程节选
Problem is here, that Player II has a continuum of strategies and trying to draw all possible probabilities over an infinite number of objects on the board is more than my drawing can do. Too hard.
现在问题是,参与人II的策略是连续的,想要把无限可能性的概率,做成图都画在黑板上,是不可能的了
耶鲁公开课 - 博弈论课程节选

In addition to the S6 and S7, it has two more on the drawing board.
NPR: China's Struggling Automakers Jump On SUV Boom

a large, flat table, often with a top that can be moved into different positions, used as a desk for drawing or designing things

A drawing board is a large flat board, often attached to a metal frame so that it looks like a desk, on which you place your paper when you are drawing or designing something.
If you say that you will have to go back to the drawing board, you mean that something which you have done has not been successful and that you will have to start again or try another idea.