而如今，休斯顿的犯罪率降至近四十年来的最低点。
However, crime in Houston is at its lowest level in almost 40 years.
本课程将检视近四十年来建筑思辩的重要转折。
The course will look at key shifts in architectural thought and debates over the last four decades.
世界卫生组织说，近四十年来，糖尿病病例数量增加了四倍。
Thee World Health Organisation says there's been a fourfold increase in diabetes in the past four decades.
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