1. Because of this, we kept looking back, wondering if we were leaving a trail of oil and petrol behind us.
    因此，我们不时地掉过头，怀疑车后是否留下了机油和汽油的痕迹。

2. Wherever it went, it left behind it a trail of dead deer and small animals like rabbits.
    无论它走哪儿，一路上总会留下一串死鹿及死兔子之类的小动物，

3. There was a trail of blood from the wounded animal.
    有一道受伤的野兽留下的血迹。

4. "Stop where you are on your trail and say, 'I'm going to get my compass out and find out what I need to do.'"
    "在你人生道路上停下来，对自己说：'我要把指南针拿出来，弄明白自己需要干什么。'"

5. A genetic trail visible on the maps shows that the breeding ground for this mixed population probably lies in Ethiopia or the Middle East.
    图谱上显示的遗传轨迹表明这一混血人种的发生地可能就在埃塞俄比亚或中东地区。