成千上万年的基因改造才有了香气扑鼻、营养丰富、便于收割的庄稼，才有了服服帖帖、任劳任怨的家畜。 但是回首当年，那却是一路的艰辛。
Thousands of years of genetic modification have led to sweet, rich, easy-to-harvest crops and obedient, compliant domestic animals; but back then it was an uphill struggle all the way.
当我们逐渐老去，回首当年，我会对它们付诸一笑。
他们现在的状态使他们的球迷不得不去回首当年球队在总经理丹尼安吉的带领下球队和替补是多么的强大的那个年代了。
The current lapse has forced their loyal and knowledgeable fans to shift from grappling for historical perspective to whining about how Danny Ainge allowed Boston's once-formidable bench to atrophy.
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