Trying to learn how to translate from the human translation examples.
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\<emph\>goto labelname:\</emph\>發生錯誤時,讓錯誤處理常式跳換到「labelname」行處開始執行。
\<emph\>goto labelname:\</emph\> if an error occurs, enables the error-handling routine that starts at the line "labelname".