They clear foliage from the trees to allow in light, then grow the plants between the trunks to hide them from aerial detection by the drug authorities.
他们把树上的叶子清理好，让光线照射进来，然后在树的躯干旁种植，以此掩人耳目，逃避打击毒品部门的侦查。
Shadows result from roadside building or trees are one of the factors that arise errors in video based vehicle detection.
但是由路边建筑、树木引起的阴影，是导致车辆检测错误的一大主要因素。
Passive shadows resulted from roadside buildings or trees and active shadows caused by moving vehicles, are one of the factors that arise errors in video based vehicle detection.
在基于视频图像的交通监视系统中，由路边建筑、树木等物体引起的静态阴影和由运动物体如车辆引起的运动阴影，是导致车辆检测错误的一大主要因素。
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