In the option pricing with martingale way, the most important aspect is finding the equivalent martingale measure to make the discounted stock price process become martingale.
在期权定价的鞅方法中最重要是找到等价鞅测度，使得贴现的股票价格过程是鞅。
In the spectrum bandwidth and cost aspect, Spectrometers with prisms and grating are equivalent.
在光谱带宽和成本方面，棱镜光谱仪与光栅光谱仪基本接近。
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