我已经定义了一种newtheorem风格，我想将定理从其余部分稍微向下移动一点，但我做错了。我有这样的东西：
\documentclass{book}
\usepackage{xcolor}
\usepackage{amsthm}
\newtheoremstyle{Marine}% name
{3pt}% Space above
{3pt}% Space below
{}% Body font
{}% Indent amount
{}% Theorem head font
{:}% Punctuation after theorem head
{\newline}% Space after theorem head
{\underline{\thmname{#1}\thmnumber{ #2}}\thmnote{ \textcolor{red}{ (#3)}}}% Theorem head spec (can be left empty, meaning ‘normal’)
\theoremstyle{Marine}
\newtheorem{definition}{Definition}[section]
我怎样才能让它工作？