This image, like many Hubble images, has a curious stair-step shape.
这幅图像如同很多其他哈勃图像，具有奇异的阶梯状外形。
2
For the 3 best causes of the left side (How made), stair-step by asking why as long as you get more precise information. Probably you found the root-causes.
对于左侧(如何产生)的3个最好的原因，一旦有了更精确的信息就逐级问为什么。或许你会找到根本原因。
3
Traders like to see the market make moderate, stair-step advances rather than shooting straight higher, which many see as as ign of unsustainable and impulsive buying.