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。
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。
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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