为给定的一段英文文本提供摘要。 
原文本：This is a sample text for testing text summarization. Text summarization is the process of creating a shorter version of a longer text while retaining its main ideas. There are different techniques for text summarization, including extraction-based summarization and abstraction-based summarization. In extraction-based summarization, the most important sentences or phrases are selected from the original text and used to create a summary. In abstraction-based summarization, the summary is created by paraphrasing and condensing the original text.
Text summarization is the process of creating a shorter version of a longer text while retaining its main ideas, and there are two techniques for it: extraction-based summarization, which selects important sentences or phrases, and abstraction-based summarization, which paraphrases and condenses the text.