Plans for 45 roads within the CBD have been approved, measuring 41.5 kilometers in total.

在CBD内新建45条道路的规划已获批准，总长度为41.5千米。当measure用作动词时，如果主语是人，其意思是“测量，估量”；如果主语是物，则指“（长度、宽度、数量的）数值为”。例如：He measured the length and width of the gap. 他测量了一下这条缝隙的长与宽。The house is more than twenty meters long and measures six meters in width.这座房子长20多，宽6米。in total 总共，总计。例如：In total, we plan to shut down at least 800 data centers. 我们计划总共关闭至少800个数据中心。These products, in total, account for about 80% of all our sales. 这些产品总共约占我们全部销售额的80%。

The first underground floor is set aside mainly for pedestrians and commercial facilities, while the second underground floor is planned for parking.

地下一层主要用于行人和商业设施，而地下二层计划为停车场。注意该句中while作并列连词用，表对比，意为“而......”。例如：Most cinema-goers are young people, while the old people prefer watching TV at home. 大多数年轻人喜欢去电影院看电影，而老年人偏爱在家看电视。set aside 留出；存（钱），划拨（钱）。例如：£ 130million would be set aside for repairs to schools. 将划拨1.3亿英镑用于学校的修缮。

he city has also invested 140 million yuan to set up a traffic inquiry system, through which the public can check traffic conditions online and see the most convenient routes on their GPS system.

北京市还投资1.4亿元建立了一个交通查询系统，通过这个系统，市民可以在网上查询交通状况，在GPS系统上查到最方便的路线。through which是“介词+关系代词”结构，在此处引导非限制性定语从句来修饰限定先行词system。关系代词作介词宾语时，常常把介词置于关系代词之前。介词的选择取决于其与作先行词的名词、代词的搭配，或与定语从句中谓语动词的搭配。例如：This is the house in which I lived two years ago. 这是我两年前住过的房子。Frank's dream was to have his own shop in which he could sell the workings of his own hands. 弗兰克的梦想是拥有一家可以销售自己的手工制品的商店。