\definecolor{taupegray}{rgb}{0.55, 0.52, 0.54}
\tikzstyle{er} = [rectangle,minimum width=7cm,minimum height=2.5cm,text centered,draw,drop shadow,rounded corners]
\begin{tikzpicture}[node distance = 0,scale = 0.55]
\tikzstyle{every node}=[scale=0.55]
\node (encoder)[er,thick,minimum width=5.5cm,fill=ugreen!20]{\huge{编码器}};
\node (decoder)[er,thick,right of=encoder,xshift=7.75cm,fill=red!20]{\huge{解码器}};
\node (decoder_1)[er,thick,right of=decoder,xshift=8.75cm,fill=red!20]{\huge{解码器}};
\draw [->,very thick,draw=blue!70]([xshift=0.2cm]encoder.east) --  ([xshift=-0.2cm]decoder.west);

\begin{pgfonlayer}{background}
\draw [->,very thick,draw=blue!70]([xshift=0.2cm,yshift=-0.8em]encoder.east) --  ([xshift=-0.2cm,yshift=-0.8em]decoder_1.west);
\end{pgfonlayer}

\foreach \x in {-2.2cm,-1.1cm,...,2.2cm}
\draw [->,very thick,draw=black!70]([xshift=\x,yshift=-1cm]encoder.south) --  ([xshift=\x,yshift=-0.2cm]encoder.south);
\node [below of = encoder,xshift=-2.3cm,yshift=-2.95cm,scale=1.2]{\large{<LEN>}};
\node [below of = encoder,xshift=-1cm,yshift=-2.9cm,scale=1.2]{\large{hello}};
\node [below of = encoder,xshift=0cm,yshift=-3.05cm,scale=1.2]{,};
\node [below of = encoder,xshift=1.1cm,yshift=-2.9cm,scale=1.2]{\large{world}};
\node [below of = encoder,xshift=2.2cm,yshift=-2.9cm,scale=1.2]{!};

\draw [->,very thick,draw=black!70]([xshift=-2.2cm,yshift=0.2cm]encoder.north) --  ([xshift=-2.2cm,yshift=1cm]encoder.north);
\node [below of = encoder,xshift=-2.2cm,yshift=2.9cm,scale=1.5]{4};

\foreach \x in {-2.7cm,-0.9cm,...,2.8cm}
{\draw [->,very thick,draw=black!70]([xshift=\x,yshift=-1cm]decoder.south) --  ([xshift=\x,yshift=-0.2cm]decoder.south);
\draw [->,very thick,draw=black!70]([xshift=\x,yshift=0.2cm]decoder.north) --  ([xshift=\x,yshift=1cm]decoder.north);}
\node [below of = decoder,xshift=-3cm,yshift=-2.9cm,scale=1.6]{\small{<Mask>}};
\node [below of = decoder,xshift=-1cm,yshift=-2.9cm,scale=1.6]{\small{<Mask>}};
\node [below of = decoder,xshift=1cm,yshift=-2.9cm,scale=1.6]{\small{<Mask>}};
\node [below of = decoder,xshift=3cm,yshift=-2.9cm,scale=1.6]{\small{<Mask>}};
\node [below of = decoder,xshift=-3cm,yshift=2.9cm,scale=1.6]{你好};
\node [below of = decoder,xshift=-1cm,yshift=2.7cm,scale=1.6]{，};
\node [below of = decoder,xshift=1cm,yshift=2.9cm,scale=1.6]{你好};
\node [below of = decoder,xshift=2.9cm,yshift=2.9cm,scale=1.6]{！};


\foreach \x in {-2.7cm,-0.9cm,...,2.8cm}
{\draw [->,very thick,draw=black!70]([xshift=\x,yshift=-1cm]decoder_1.south) --  ([xshift=\x,yshift=-0.2cm]decoder_1.south);
\draw [->,very thick,draw=black!70]([xshift=\x,yshift=0.2cm]decoder_1.north) --  ([xshift=\x,yshift=1cm]decoder_1.north);}
\node [below of = decoder_1,xshift=-2.7cm,yshift=2.9cm,scale=1.6]{你好};
\node [below of = decoder_1,xshift=-0.9cm,yshift=2.7cm,scale=1.6]{，};
\node [below of = decoder_1,xshift=0.9cm,yshift=2.9cm,scale=1.6]{世界};
\node [below of = decoder_1,xshift=2.7cm,yshift=2.9cm,scale=1.6]{！};

\node [below of = decoder_1,xshift=-2.7cm,yshift=-2.9cm,scale=1.6]{你好};
\node [below of = decoder_1,xshift=-0.9cm,yshift=-3cm,scale=1.6]{，};
\node [below of = decoder_1,xshift=0.9cm,yshift=-2.9cm,scale=1.6]{\small{<Mask>}};
\node [below of = decoder_1,xshift=2.7cm,yshift=-2.9cm,scale=1.6]{！};


\end{tikzpicture}