WHY

function MergeFiles($chsFile, $engFile){
    $hash = @{}; $s1 = $s2 = '';
    ForEach($strLine In (type $chsFile)){
        If($s1 -like '[0-9][0-9]:*') { $hash[$s1] = $strLine; }
        $s1 = $strLine;
    }
    ForEach($strLine In (type $engFile)){
        If($s2 -like '[0-9][0-9]:*'){$strLine + ' ' + $hash[$s2];}
        $s2 = $strLine;
    }
}

$chsDir = 'C:\Users\CH6\Desktop\TEDTXTUNICODE\chs1203';
$engDir = 'C:\Users\CH6\Desktop\TEDTXTUNICODE\eng1246';
$mergeDir = 'C:\Users\CH6\Desktop\TEDTXTUNICODE\merge';

If(!(Test-Path $mergeDir)){$null = md $mergeDir;}

ForEach($eng In (dir ($engDir + '\*.txt'))){
    $chsFile = $chsDir + '\' + $eng.Name;
    If(Test-Path $chsFile){
        $arr = MergeFiles $chsFile $eng.FullName;
        Set-Content ($mergeDir + '\' + $eng.Name) $arr -Enc unicode;
    }
}

[Console]::Write('Done');
[Console]::ReadLine()
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