urban canyon effect

基本解釋

Under the urban conditions common in Hong Kong, the street canyon effect works to potentiate pollutant build-up during peak-traffic periods.
在香港這種典型的城市環(huán)境之下，街道峽谷效應可使空氣污染物在交通高峰期積聚。

In-car GPS developers have long had to wrestle with the urban canyon effect that blocks or bounces signals downtown: they often have to make best guesses for accuracy when they can't count on cellular or WiFi triangulation to pick up the slack, like a smartphone would.
ENGADGET: New in-car GPS tech uses motion sensors for accurate, autonomous city driving