求翻译：河谷熔岩就分布在分水岭两侧的河谷和洼地中，并且沿着河谷蜿蜒而下，直接覆盖在河床上。河谷熔岩流通常很长，可达十几公里，但宽度相对较窄。是什么意思？

Valley lava located in the watershed on both sides of the valley and depressions, and along the valley winding down, directly over the riverbed. Valley lava flows are usually very long, up to a dozen kilometers, but the width is relatively narrow.

Lava river valley watershed is located in the side of the valley, and the depressions and along the winding River Valley directly over the river. Valley lava flows is usually long, up to 10 km, but relatively narrow width.

正在翻译，请等待...

Valley lava distribution in the watershed in the valleys and depressions on either side of, and along the valley winds down, direct overwrite in the river bed. Valley lava flows are usually very long, up to a dozen kilometres, but relatively narrow width.

The river valley lava distributes in the watershed both sides river valley and the marsh land, and winds along the river valley under, direct cover on river bed.The river valley lava flow very is usually long, may amount to several kilometers, but width relative narrow.