一個(gè)賽跑運動(dòng)員甚至回頭看一眼后面的運動(dòng)員還有多遠，就可能失去很多優(yōu)勢。
A runner can lose a lot of advantage by even glancing back to see how far behind the others are.
回頭看來(lái)路時(shí)，我們可以看見(jiàn)整個(gè)河谷展現在身后。
Looking back the way we had come, we could see the whole valley spread out behind us.
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