如何在FPDF中自动调整单元格中的文本？

Question

我正在使用FPDF和PHP生成报告。当文本太长时，它会溢出。我怎么能阻止这个？

$string = "IT IS TOO LONG IT IS TOO LONG IT IS TOO LONG IT IS TOO LONG IT IS TOO LONG IT IS TOO LONG";
       $pdf->Cell(190,10,'Observations: '.$string.'',0,0,'C');