The Obamas have had difficult times in their marriage, as have many couples struggling to balance the intense demands of career, family and relationship.

奥巴马夫妇的婚姻曾有过艰难时光，与许多其他夫妇一样，曾努力平衡职业、家庭和婚姻关系的强烈需求。

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Imagine that these two couples are standing at either end of a pair of scales. They are evenly balanced, so this is a classic example of symmetrical balance.

想像一下这两对情侣正站在一副天平的两端。他们达到了均匀的平衡，这是一个对称平衡的经典例子。

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