如果您看不懂某个单词或短语的含义，您可以说"I don't understand the meaning of this word/phrase"，这句话的来源是英语中常用的表达方式。例如：

I don't understand the meaning of "diligence" in this sentence.

我不明白这句话中"勤奋"一词的含义。

如果您看不懂整个句子或段落的含义，您可以说"I don't understand the meaning of this sentence/paragraph"，这句话的来源也是英语中常用的表达方式。例如：

I don't understand the meaning of this paragraph about the benefits of exercise.

我不明白这段关于锻炼好处的段落的含义。

希望我的回答能够帮到您。