definition mode

例句：

1. 1. The definition of a word is its meaning in context.
   一个词的定义是它在语境中的意思。
2. 2. The teacher provided a detailed definition of the term "ecosystem".
   老师详细解释了“生态系统”这个词的含义。
3. 3. The dictionary defines words according to their usage and context.
   字典根据它们的使用和上下文来定义词语。