when i walked a half-hour
...清晰 » My academic goals has become increasingly clear with further research 当我走了半小时 » When I walked a half-hour 我们学到了很多知识 » We learned a lot of knowledge ..
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when i walked a half-hour
当我走了半个小时
以上为机器翻译结果，长、整句建议使用 人工翻译 。