Plain and contrast意思

"Plain and contrast" is not a common phrase in English, so it's likely that you meant "compare and contrast." The phrase "compare and contrast" is used to describe a type of writing or analysis that examines the similarities (compare) and differences (contrast) between two or more things.

Here's a breakdown of the meanings:

When you "compare and contrast" two things, you are doing both of these actions simultaneously. For example, if you were writing an essay about the similarities and differences between the political systems of the United States and Canada, you would be comparing (pointing out the similarities) and contrasting (pointing out the differences) the two countries' political systems.

In academic writing, compare and contrast essays are a common assignment, and they require the writer to analyze the points of similarity and difference between the subjects being compared.