Tabularx the width of the elastic column in a macro package \hsize

\documentclass{article}
\usepackage{amsmath}
\USEPACKAGE{AMSSYMB}
\usepackage{latexsym}
\USEPACKAGE{CJK}

\usepackage{tabularx}
\usepackage{array}

\newcommand{\preservebackslash}[1]{\let \temp =\\ #1 \let \ = \temp}
\newcolumntype{c}[1]{>{\preservebackslash\centering}p{#1}}
\newcolumntype{r}[1]{>{\preservebackslash\raggedleft}p{#1}}
\newcolumntype{l}[1]{>{\preservebackslash\raggedright}p{#1}}

\begin{document}
\begin{cjk*}{gbk}{song}
\cjktilde

\begin{tabularx}{10.5cm}{|p{3cm} |>{\setlength{\hsize}{.5\hsize}\centering}x |>{\setlength{\hsize}{1.5\ Hsize}}x|}
%\hsize is the column width that is automatically calculated, and the number preceding the \hsize in {. 5\hsize} and {1.5\hsize} must be equal to the number of elastic columns in the table. For this example, the Flex column has 2 columns, so ". 5+1.5=2" is correct.
% Total 3 columns with a total column width of 10.5cm. The 1th column has a width of 3cm and the column width of column 3rd is 3 times times that of the column width of the 2nd column, which is automatically calculated. The 2nd column is centered around the text. Note: The \multicolum command cannot span the x column.
\hline
The wise fish often row the temple before biting the hook & this is because they want to break food safety & know they think it's dangerous \
\hline
They will not eat & if they decide there is no danger & they remarked swallow hooks \ \
\hline
A glimpse of the danger of bait, but also involuntarily to swallow the hook & that is just people's psychology and not the psychology of Fish & is a man's folly and not the fish of the Ken \
\hline
\end{tabularx}

\end{cjk*}
\end{document}