1.They walk along the Frijoles stream lined with green trees that once was the only water supply for the valley.

lined with排满

2.Ash up to three hundred meters thick covered more than six hundred square kilometers around the volcano.

up to多达

例句：I can take up to four people in my car.
      我的汽车最多能坐四个人。

直到

例句：Up to now he's still quiet.
           他直到现在仍保持沉默。

3.The hunters left spear points shaped out of stone that they used as weapons.

shape out形成，成……形，顺利进行

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