!! +exec+ +var+ +string+
$lst_tit listintersect$lst_titend$type_both
  $lst_alias listintersection
  $(lst_syntax)listintersect $emph list1$emphend and $emph list2$emphend</tt>
  $lst_mean 返回 $emph list1$emphend 与
  $emph list2$emphend 里都出现的项. 重复的项被取消.

