我对 TeX/LaTeX 还很陌生，刚刚发现当我输入
\text{blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah}
文本似乎会自动越过页面的右侧，而不是开始新行。我知道有手动操作的方法，但我不记得几年前使用这个功能时必须不断手动决定何时开始新行。
我使用了一个模板，并没有做太多改动。这是我目前所拥有的：
\documentclass[a4paper,10pt]{article}
\usepackage{graphicx}
\usepackage{framed}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
% \usepackage{cite}
\usepackage{mathrsfs}
\usepackage{array}
%here is me defining some commmands myself
\providecommand{\R}{\mathbb{R}}
\providecommand{\abs}[1]{\lvert#1\rvert}
\providecommand{\chooseq}[2]{\binom{#1}{#2}=\frac{#1!}{#2!\left(#1-#2\right)!}}
\providecommand{\dettwobytwo}[4]{\det \begin{pmatrix}
#1 & #2 \\
#3 & #4
\end{pmatrix} = #1\times#4-#2\times#3}
% this first part is the pre-able - it won't appear in the final document,
% the pre-amble is what you set up behind the scenes.
% You can specify the look of the finished document and what "packages" of
LaTeX code can be used
\title{Lecture Notes}
\author{Me}
\begin{document}
\centerline{\Huge Lecture Notes}
\bigskip \bigskip \bigskip
\centerline{\Large Chapter 1}
\bigskip \bigskip \bigskip
\text{blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah}
\end{document}
我不知道我哪里做错了，希望得到一些帮助。