The makers of the tracking systems say the software can determine the viewer's gender, approximate age range and, in some cases, ethnicity - and can change the ads accordingly.

这套追踪系统的制造商说该系统能够分辨出观看者的性别、大致的年龄范围，有时还能看出种族，然后根据具体情况改变广告的内容。

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In track simulation, the corresponding earth equivalent radius of a track in a specific range is approximate to the earth curvature radius of the latitudinal location of the target.

介绍了在航迹模拟中，一条航迹在一定范围内对应的地球等效半径，可以近似为目标所在的纬度的地球曲率半径。

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The results show that the reduced bilinear model developed can approximate the reactor dynamics more accurately than the linear one over a much wider range around the operating state.

结果表明，这样产生的双线性模型能此线性近似模型在较宽的工作范围内精确地近似反应器的动态特性。

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