天然桥natural bridge ：亦称天然拱门(natural arch)。天然生成的类似桥的拱形地形。大部分天然桥是水平层状的块状砂岩或灰岩的侵蚀形态。
有的动物掉进天然沥清坑里被保存下来，如在兰桥。拉。布里——现在是洛杉矶的郊区发现的大象、剑齿虎和许多其他动物。
Other animals were trapped in tar pits, like the elephants, sabre-toothed cats, and numerous other creatures that are found at Rancho la Brea, which is now just a suburb of Los Angeles.
由于行吟阁过落羽桥是一块天然的三角洲，依地势建有一个扇形的长廊，而又临近湖岸，所以取名为“濒湖画廊”。
As a devoted Court charged plume Bridge is a natural delta, according to the terrain there is a fan-shaped construction of the promenade, and near Lakeshore, named "Dying Lake galleries."
本实验研究是针对中原桥口油田南八仙浅层桥69-08井注天然气项目进行的。
This study is aimed at a natural gas injection project to be performed in well Q-69-08 of Nanbaxian shallow reservoir in Qiaokou, Zhongyuan.
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