Females ready to mate leave scent trails 准备交♥配♥的雌性会留下气味痕迹
There are faint trails in the ooze, 海底泥中也有些微的踪迹
The Okavango becomes criss-crossed with trails as animals move into its heart. 动物们逐渐进入奥卡万戈的中心地带 这里的路变得纵横交错