The black part is as thick as the black parts of the 'e'. Same x-height.
它最粗的部分和“e”最粗部分的笔画宽度相同，同样的x-高度。
2
Same thickness, the character has the same x-height, but now it has serifs.
同样的宽度，同样的x-高度，但这次它有了衬线。
3
If the type is printed in big sizes there can be a much smaller difference between the x-height of the light and the black weight (bottom line drawing).