To traverse extremely difficult and dangerous terrain, enduring great hardships, metaphorically by building ladders on mountains and bridges across ravines.
探险队为了寻找稀有植物，不畏艰险，梯山架壑，最终在深山中发现了宝贵的物种。
To find rare plants, the expedition team feared no danger, scaling mountains and bridging ravines, finally discovering precious species deep in the mountains.
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