请问如何在sap内表中合并字符串？

在内表中有多行，现在想把每一行合并成一个字符串，求大神！

在前面保存到内表的操作如下：

  DATA: str1 TYPE string,
itab TYPE TABLE OF string,
text TYPE string VALUE 'Presentation styles of search results have been constantly changing in these years, which affect users'' click-through behaviors. In order to discover what the'.
SPLIT text AT space INTO TABLE itab.
LOOP AT itab INTO str1.
  WRITE :/ str1.
ENDLOOP.

现在想把内表的每行再合并起来。

定义个变量拼起来呗。