平衡支点是物体稳定的关键，恰当的重心分配能确保其安全与稳固。杨过山洞玩李莫愁小说

　　With his marriage to Audrey almost at an end, Ben begins a torrid affair with Mercedes, a young French student in his writing class. The affair soon spins out of control, their emotions and Ben and Audrey's family hanging in the balance.