如果你不固執，你會過早放棄實驗。如果你不靈活，你會把頭撞在墻上，看不到你試圖解決的問題的不同解決方案。
If you're not stubborn, you'll give up on experiments too soon. And if you're not flexible, you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.
