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關注：1
2013-05-23 12:21
求翻譯：you have three layers of skin which act as a barrier against disease，poisons and the sun's harmful rays是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
you have three layers of skin which act as a barrier against disease，poisons and the sun's harmful rays
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