You'd have to know what pigments he used, in other words, what ingredients he used to make different colors of paint, because the ingredients used in paints and binding agents have changed over time.

你要知道他使用了什么颜料，换句话说，他用了什么原料来制造不同颜色的油漆，因为油漆中使用的原料和结合剂都随着时间的推移而改变。

youdao

I'm not sure how good it was, but I used simple words and, believe it or not, finished in just over nine minutes.

我不敢肯定我的发言有多好，但我用的都是简单的词汇，而且，不管你信不信，刚好只用了九分钟。

youdao

Langston Hughes was an artist who used words to express himself, but other forms of art influenced him, and his work crossed over into other mediums.

蓝斯顿休斯是个用文字来表达自己的艺术家，但他也受到其他型态的艺术影响，所以他的作品跨越到其他的媒体。

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