A strategic location where a single person can guard a pass and hold off countless enemies; describes a terrain that is extremely perilous and easy to defend but difficult to attack.
这座山谷入口狭窄，两旁峭壁林立，真是一夫当关，万夫莫敌的险要之地。
The entrance to this valley is narrow, with steep cliffs on both sides, truly a strategic location where one man can hold off ten thousand.
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