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来源：雅诚德英语网
On the western side, the challenge was the Niagara Escarpment, a 23-metre (75-foot) rock ridge. Canal engineer Nathan B.
在运河的西段挑战来自于尼亚加拉悬崖，那是一个高达23米的石质山脊，运河工程师NathanB。
On the western side, the challenge was the Niagara Escarpment, a 23-metre (75-foot) rock ridge. Canal engineer Nathan B.
在运河的西段挑战来自于尼亚加拉悬崖，那是一个高达23米的石质山脊，运河工程师NathanB。