And the inflection here refers to how the base word is changed according to its use in a sentence.

这里的曲折变化指的是这个词干如何根据它在某个句子中的用法而变化。

In formal writing: use Latin based words, use uncommon words.

在正式写作中：使用基于拉丁语的词，使用不常见的词。

A word that cannot be broken down into parts is called the root, or base word.

不能分解成多个部分的词称为词根或基词。

For example, with the word " unhappy, " students would learn how " un-" changes the meaning of the base word " happy."

例如，“unhappy”这个词，学生们就会学到“un-”如何改变基本单词“happy”的意思。

A prefix is a small part of a word, usually just a couple of letters, that we put at the front of a base word to change its meaning.

前缀是单词的一小部分，通常是几个字母组成的，放在原词前能改变词义。