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  1. !! +exec+ +string+
  2. tit:eval
  3. type:$type_var
  4. alias:evalue
  5. syntax:!eval `expr'
  6. mean:·µ»Ø±í´ïʽ `expr' µÄÊýÖµ,\
  7.   ¶øÇÒÊÇʵÊý(¶ÔÓÚÄ¿Ç°µÄwims°æ±¾). ÄÚ²¿¼ÆËãÊÇÒÔË«¾«¶È½øÐеÄ,\
  8.   µ«´òÓ¡¾«¶ÈÓɱäÁ¿ `wims_print_precision' È·¶¨(ÆäĬÈÏÖµÊÇ 8). <br>\
  9.  Èç¹ûÔÚ±í´ïʽ `expr' ÄÚ³ö´í, Ôò·µ»Ø 0.\
  10.   (ÎÒÖªµÀÕâ²»ºÃ; µ«Ä¿Ç°ÎÒ»¹Ã»ÓÐʱ¼ä¸ã¶¨.)
  11.