基于传统的阶梯式均匀传输线逼近模型，对非均匀传输线进行分段指数逼近。

Based on the conventional ladder model, the exponential model is adopted to approach the nonuniform transmission lines.

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大约一年后，金价再度逼近每盎司1,000美元关口，当时信贷危机全面爆发、经济深陷衰退、标准普尔500指数跌至12年低点。

Roughly a year later, gold approached $1, 000 again, with the credit crunch in full swing, the economy deep in recession and the S&P 500-stock index hitting a 12-year low.

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周三，道琼斯工业指数（Dow Industrials）暴涨108点，逼近10000点的高度，纳斯达克综合指数上涨31点，标准普尔上涨16 点。

Wednesday, the Dow industrials jumped 108 points, drawing closer to the 10000 level, the Nasdaq Composite rose 31 points and the S&P 500 added 16 points.

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