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。

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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。

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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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Smaller rural agencies can also access the data to maintain assets in the field like water lines, fire hydrants, trails, vegetation, wildfire mitigation areas, and more.

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Every summer, local and foreign volunteers converge on Lake Baikal, the oldest, deepest and largest lake on Earth, to signpost and improve the hiking trails that skirt the water.

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The three year old used to ski down that hill, skate on the frozen water, and wander off on animal trails.

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