如果你不固執(zhí)，就會過早放棄試驗。如果你不靈活，就會頭撞南墻，而無法另辟蹊徑解決當下難題。
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.
