求翻译：一般来说，文章的主旨经常会被表述在文章的首尾中，首尾既包括文章的首段尾段，又包括每一段的段首句和段尾句。要想快速把握文章中心，首尾段和各段之首尾句是最佳切入点，因此同学们应格外注意它们。是什么意思？

In general, the thrust of the article will often be expressed in the article's end to end, the end to both the first paragraph of the article mentioned at the end, it also includes a segment of each sentence and paragraph last sentence. To quickly grasp the article center, end to end to end sections

Generally speaking, the article's keynote will often be expressed in the article, inclusive of both dates inclusive including articles, the first paragraph also include each end of the paragraph a sentence of the first paragraph of paragraph last sentence and paragraph. If you want to quickly grasp

Generally speaking, the article primary intention can indicate frequently in the article head and tail, the head and tail both includes the article the first section of final stage, and includes each section of section first sentence and the section last sentence.Must want to grasp the article cente

In General, the thrust of the article will often be expressed in the article in the first and last, first and last includes both the tail section of the first paragraph of the article, and every paragraph of the first sentence and the end of the paragraph. If you want to quickly grasp the articles C

In general, the thrust of the article will often be expressed in the article's end to end, the end to both the first paragraph of the article mentioned at the end, it also includes a segment of each sentence and paragraph last sentence. To quickly grasp the article center, end to end to end sections