Treacherous terrain tested limits of human endurance.
Meaning: This sentence is describing how a difficult journey can test how much a person can endure.
Choice of Words: Treacherous means dangerous and difficult to travel on, terrain is the physical features of an area of land, tested means to find out the limits or capabilities of something, limits are the points beyond which something cannot go, human means relating to people, and endurance is the ability to withstand hardship or pain. When you put them together, it means a dangerous landscape showed how much people could handle.
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