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各位大神们，这是怎么回事吖ww

Notes:
      1.  Unicode is supported; see help unicode_advice.
      2.  Maximum number of variables is set to 5000; see help set_maxvar.

.  tsset stkcd year
no variables defined
r(111);

. import excel "C:\Users\DELL\Desktop\三废.xlsx", sheet("Sheet1") firstrow
(5 vars, 210 obs)

. tsset code year
variable code not found
r(111);