Northern Colorado's Big Thompson River flows from the Rocky Mountains (west) to the Great Plains (east) through a steep-walled, boulder-strewn canyon.
北科罗拉多州的大汤普森河，从落基山脉(西)经遍布卵石的陡峭峡谷流向大平原(东)。
A boulder becomes dislodged, crushing his right forearm and trapping it against the canyon wall.
他的右前臂被砸伤，还夹在了岩壁与滑落的石块之间无法动弹。
A boulder becomes dislodged, crushing his right forearm and trapping it against the canyon wall.
他的右前臂被砸伤，还夹在了岩壁与滑落的石块之间无法动弹。
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