through many tortuous
经历了许多曲折
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Sometimes it comes up against a narrow section flanked by high mountains and steep cliffs, winding through a course with many a perilous twist and turn-following a dangerous tortuous course.
有时流到很逼狭的境界，两岸丛山迭岭，绝壁断崖，江河流于其间，回环曲折，极其险峻。
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