如何在LaTeX文章中完全對齊對齊？

Question

我是LaTeX的初學者。我嘗試了幾個例子，但我不能做一個完全對齊的理由。也許這個問題不是很煩人，你可以幫忙。

還有就是我的代碼示例：

\documentclass[10pt,a4paper]{article} 
    \usepackage[utf8]{inputenc} 
    \usepackage[L7x]{fontenc} 
    \usepackage[lithuanian]{babel} 
    \usepackage{multicol} 
    \usepackage[left=1.5cm,right=1.5cm,top=2cm,bottom=2cm]{geometry} 

    \begin{document} 
    \title{text text text text text text text text text text text text} 
    \author {text text text text} 
    \date{} 
    \maketitle 
    \center{\textit{ text text text text text text}} 
    \center{\textit{ text text text text text text}}\\ 
    \small\textbf{Abstract.} 
    An abstract is a brief summary of a research article, thesis, review, conference proceeding or any in-depth analysis of a particular subject or discipline, and is often used to help the reader quickly ascertain the paper's purpose. When used, an abstract always appears at the beginning of a manuscript or typescript, acting as the point-of-entry for any given academic paper or patent application. Abstracting and indexing services for various academic disciplines are aimed at compiling a body of literature for that particular subject. 
    \begin{multicols}{2} 
    \section*{\large Preface} 
    Academic literature uses the abstract to succinctly communicate complex research. An abstract may act as a stand-alone entity instead of a full paper. As such, an abstract is used by many organizations as the basis for selecting research that is proposed for presentation in the form of a poster, platform/oral presentation or workshop presentation at an academic conference. Most literature database search engines index only abstracts rather than providing the entire text of the paper. Full texts of scientific papers must often be purchased because of copyright and/or publisher fees and therefore the abstract is a significant selling point for the reprint or electronic form of the full text. 
    \section*{\large Some theory} 
    An abstract allows one to sift through copious amounts of papers for ones in which the researcher can have more confidence that they will be relevant to his or her research. Once papers are chosen based on the abstract, they must be read carefully to be evaluated for relevance. It is commonly surmised that one must not base reference citations on the abstract alone, but the entire merits of a paper.\\ 
    \end{multicols} 
    \end{document} 

預先感謝您。

Answer 1

這

\center{\textit{ text text text text text text}} 

是不這樣做的正確方法。此\中心將爲eintire文檔生效。 （對於\ raggedright或\ raggedleft，情況也是如此）一旦將全局對齊設置爲其他內容（中心raggedright或raggedleft），無法恢復到對齊對齊方式

您應該將括號放在\中心標籤...這是

{\center\textit{ text text text text text text}} 

（這可是不把你想在頁面的中間，但只到左邊部分的盒子居中，雖然文本將在那裏爲中心的文本）。乾淨的方式做你可能想要做的是使用中心環境（\開始{中心}和\結束{中心}

\begin{center}\textit{ text text text text text text}\end{center}