我在文章开头写了这些
% This is samplepaper.tex, a sample chapter demonstrating the
% LLNCS macro package for Springer Computer Science proceedings;
% Version 2.20 of 2017/10/04
%
\documentclass[runningheads]{llncs}
%
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{amsthm}
\usepackage{longtable}
\usepackage{multirow}
\usepackage{color}
\usepackage{ mathtools, nccmath}
\usepackage{latexsym}
\usepackage[title]{appendix}
%
%
\newtheorem{lemma}{Lemma}[section]
\newtheorem{theorem}[lemma]{Theorem}
\newtheorem{proposition}[lemma]{Proposition}
\newtheorem{corollary}[lemma]{Corollary}
\newtheorem{conjecture}[lemma]{Conjecture}
\newtheorem{construction}[lemma]{Construction}
\newtheorem{example}[lemma]{Example}
\newtheorem{definition}[lemma]{Definition}
\renewcommand{\Gamma}{\varGamma}
\renewcommand{\epsilon}{\varepsilon}
\renewcommand{\bar}{\overline}
\renewcommand{\hat}{\widehat}
\DeclareMathOperator{\Cir}{Cir}
\renewcommand{\leq}{\leqslant}
\renewcommand{\geq}{\geqslant}
%Extra things that are included for simplicity.
\newcommand{\Po}{\mathcal{P}}
\newcommand{\R}{\mathbb{R}}
\newcommand{\Z}{\mathbb{Z}}
\newcommand{\C}{\mathbb{C}}
%
%
\newcommand{\Sym}{\mathrm{Sym}}
\newcommand{\vt}{\mathrm{vert}}
\newcommand{\conv}{\mathrm{conv}}
\newcommand{\Fix}{\mathrm{Fix}}
\newcommand{\Span}{\mathrm{Span}}
\newcommand{\rank}{\mathrm{conv}}
\newcommand{\rank}{\mathrm{rank}}
\newcommand{\rank}{\mathrm{Cir}}
当我制作 pdf 时，开头有一个额外的页面，上面有这两行
Lemma[section] [lemma]Theorem [lemma]Proposition [lemma]Corollary [lemma]Conjecture [lemma]Example [lemma]Definition
为什么会这样？我该如何解决？