But even if we focus on the bottom 10 percent or 20 percent of Americans, it would still be difficult to identify who the poor are, because the composition of this group changes constantly.

但即使我们目光放在最底层的10%或20%美国人身上，我们也还是很难辨认出谁才是真正的穷人，因为这个群体的构成是经常变动的。

youdao

The red orb at bottom left is a young planet, similar in composition to Jupiter, orbiting a brown dwarf, a dim, failed star that is probably 42 times less massive than the sun.

左下角红色球体，是一颗年轻行星，其组成成分和木星相似，绕褐色矮星做轨道运行。

youdao

This bottom-up focus on team composition can show strong reasons to stay Agile, now more than ever.

对团队成分的自底向上的关注，此时更能显示出保持敏捷性的重要原因。

youdao

Thus, the composition of benthic communities (the term indicates a dependency on the bottom) will rely partly on the availability of organic substances falling all the way down to the seabed.

UNESCO: MEDIA SERVICES