【正确答案】Life contains neither unalloyed happiness nor mere misery^①. Happiness and misery beget, complement and set off each other^②.
   Happiness is a wisp of fleecy cloud; misery a mass of threatening dark cloud^③. These different clouds overlap on the horizon of your life to create a beautiful dusk for you when "the setting sun is most lovely indeed"^④.
   An individual's life must inevitably reach the point when "dusk is so near", and the rosy sunset cloud may make one nostalgic and melancholy^⑤. But human life goes on and on. The Earth ceaselessly rotates on its axis around the sun. When it is dark in the east, it is light in the west^⑥.

【答案解析】 ①“不是……也不是……”译成neither...nor...结构，是地道的表达。用unalloyed和mere分别译“只是”，以避免重复，丰富语义。而且unalloyed含有“未掺杂不愉快之感的，纯粹的”之意，用于修饰happiness非常恰当。
   ②“快乐和痛苦是相生相成，互相衬托的”也可译为Each growing out of the other, happiness and misery go hand in hand, complementing and setting off each other，但不太符合原文简洁明快的风格。
   ③翻译太过拘泥于原文词语的字面意思是行不通的，应该理解和把握其真正的含义。“压城的乌云”真正的意思是“痛苦就像使人感到压抑的乌云”，所以译为a mass of threatening dark cloud。
   ④文中用“夕阳无限好，只是近黄昏”诗句讨论生命规律，可以采用意译的方法。
   ⑤原文中的“留恋、惆怅”虽然是动词，但是考虑到译文中使用了“make sb.+a.”的结构，因此需要将词性转变为形容词，译为nostalgic和melancholy。
   ⑥原句用“不亮”和“亮”旨在加强语义对比。译文用dark和light与之对应，功能相似。