It was largely a matter of trial and error.

　　這主要是個反復實驗的問題。

　　The bug was caused by an error in the script.

　　這個故障是由腳本程序出錯造成的。

　　The margin of error was plus or minus three percentage points.

　　誤差幅度在三個百分點左右。

　　The accident was caused by pilot error.

　　這場事故是飛行員的失誤造成的。