两个环绕星系都类似于很久以前撞在一起形成巨型星系(如银河系)的较小星系，所以该发现有助于说明我们星系的构筑材料是如何形成和演化的。
Both satellite galaxies resemble the ones that smashed together long ago to create giant galaxies like our own, so the discovery helps illuminate how such galactic building blocks formed and evolved.
铣刀或类似的切割工具必须与落鱼的材料和井筒条件相适应。
The mills, or similar cutting tools, must be compatible with the fish materials and wellbore conditions.
一世纪罗马人建造的古代混凝土体育馆使用非常类似的材料，和熟练的工匠石头建成的罗马帝国著名的道路网络。
The first century Romans built much of the ancient Coliseum using concrete-like materials, and skilled stone artisans constructed the Roman Empire's famous network of roads.
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