This is a major improvement over scattering calls to update statistics and to track context throughout my example application.

比起在整个示例应用程序中用分散的调用更新统计值和跟踪上下文，这是一个重大的改进。

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Major polluters must keep track of their emissions, and these data are collected and then published by the EPA.

主要的污染物必须追踪他们的排放踪迹。这些数据被收集并发表在EPA上。

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Three dozen NOAA vessels are currently working to track the oil spill and major research cruises are being put together to study the effects of the BP oil spill in the Gulf.

隶属于美国国家海洋与大气管理局，拥有三十六艘船的船队现在正在工作以追踪油污，并且大型科考船也派在一起研究BP公司在墨西哥湾的原油泄漏所造成的影响。

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I was an undergraduate here in 1995 as a freshman, I came in thinking I was going to major in government and sure enough I started off on the track; I'd like history, I'd like government, English, these kinds of things in high school.

995年我作为本科新生进入哈佛，我刚来的时候想主修政治,后来我就沿着这条路走了下去，我喜欢历史，政治和英语，就像高中的时候一样。

哈佛公开课 - 计算机科学课程节选

And there is this heartbreaking love that Sal has for Dean, and, if you track that through, the major turning points in the second two thirds of the novel are moments when Sal makes it clear to Dean that he actually cares about him.

而且萨尔对迪安有着令人悲痛的爱情，如果你追踪这一点，你就会发现小说里,三分之二的时间萨尔都在,向迪安说明他有多在乎迪安。

耶鲁公开课 - 1945年后的美国小说课程节选

All packages also include special fast access VIP entrance at the major track entrances.

FORBES: Start Planning For 2013 Kentucky Derby Now

In rare instances, engineers can observe major track problems themselves, sometimes as glaring as a kink in the rails ahead.

WSJ: Metro-North Is Set To Restore Full Service Wednesday

Mr Corden told BBC Radio Sheffield his club had agreed with the city's other major track and field club, Hallamshire Harriers, to "ensure that (Woodbourn Road) is the best facility available for the money we can raise".

BBC: Don Valley Stadium