Then the--so the term structure was downward-sloping until about two and a half years and then it was upward sloping.

期限结构线先向下倾斜,在到期期限过了两年半的时点后,才缓慢回升

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the first step in any Lewis structure is drawing the skeletal structure.

画任何路易斯结构第一步,都是先画出它的骨架。

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