1、
John is required to walk back and forth case of someone would scramble that lean.
约翰被要求来回走以防有人爬那个斜坡.
互联网摘选
2、
Back and forth I walk next to the barbedfence, trying to keep my emaciated body warm.
我沿着带刺的铁丝网内来回走动, 试图使我瘦弱的身体保持暖和.
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