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The study says there must be a complete overhaul of air traffic control systems.

研究称必须对航空交通管理系统进行彻底的改革。

《柯林斯英汉双解大词典》

The objective is to study the relationship between fetomaternal cellular traffic and hepatitis B virus (HBV) intrauterine infection.

目的是探讨母胎细胞转运与乙型肝炎病毒（HBV）宫内感染的关系。

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One study estimated that traffic congestion wasted 4.8 billion hours and 1.9 billion gallons of fuel a year for urban Americans.

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"We did a two-year traffic study to analyze exactly how every single vehicle moves through Manhattan, " she says about her decision to create the Times Square pedestrian plaza.

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David Thompson, executive director of the North Carolina Association of County Commissioners, questioned the validity of the study, saying traffic fines in the state go to support schools not county coffers.

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