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送大家一句话吧！
Age wrinkles the body. Quitting wrinkles the soul.
岁月使皮肤起皱，放弃使灵魂起皱。
——Douglas MacArthur
（道格拉斯.麦克阿瑟）
对于文科生来讲今晚的句子是不是很有当初高中的味道啊！
Aluminum remained unknown until the nineteenth century, because nowhere in nature is it found free, owing to its always being combined with other elements, most commonly with oxygen, for which it has a strong affinity.
词汇突破：Aluminum 铝
Free 元素的游离状态
Affinity 归属感
He has a close affinity with the landscape he knew when he was growing up...
他对这片从小就了解的土地有着一种归属感。
Affinity for 一种元素对于另一种元素的亲和力
主干识别： Aluminum remained unknown until the nineteenth century.
铝直到19世纪才被人发现;
其他成分： because nowhere in nature is it found free, owing to its always being
combined with other elements, most commonly with oxygen, for which it has a strong affinity.
微观分析：1.because nowhere in nature is it found free
由于在自然界找不到游离状态的铝;
2.owing to its always being combined with other elements, most commonly with oxygen
由于它总是跟其他元素结合在一起;最普遍的是跟氧结合
3.for which it has a strong affinity.
Which= oxygen
It = aluminum
= aluminum has a strong affinity for the oxygen
铝跟氧有很强的亲和力。
翻译点拨：中文习惯先翻原因，再翻结果
参考译文：铝总是跟其他元素结合在一起，最普遍的是跟氧结e合，因为铝跟氧有很强的亲和力，进而在自然界找不到游离状态的铝；所以，铝直到19世纪才被人发现。