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.