water trails 水痕迹 ; 水面痕迹
Retirees have spilled out into the suburbs where often live near golf courses, natural trails, and water.
退休人员的生活区已经蔓延到了郊区，一般住在高尔夫球场、通往自然的小径和水域附近。
And don't forget to bring water for the dog - not all trails have water sources available.
别忘了为狗带些水——并非所有的路线都能接近水源。
Comparing a control paddle and one that varied in thickness or shape, scientists found that the seal could tell the difference between the trails left in the water.
比较一个控制叶片和一个在厚度和形状上有区别的叶片，科学家发现海豹可以感觉到水中两个叶片的不同。
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