但是你发誓说“你什么都没吃”或者“体重就是不下降”，之后我们就不再讨论这个话题了。

But you swear you "don't eat anything" or "the weight just doesn't come off," and the subject is dropped.

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然后，假如说这些改变导致了销售大幅下降，你知道了问题的发生，却不知道是什么引起。

And then let's say there's a big drop in sales. The problem with this is that you don't know what caused the drop.

youdao

“我们在竖井里凿了一个洞，这样你就可以看到竖井是由什么构成，我们推出了这个新的楼梯，提供了一种戏剧性下降的方式，”他说。

"We cut a hole in the shaft so you can see what the shaft is made from, and we introduced this new staircase that provides this theatrical way down," he said.

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