half-graben英'hɑːfɡr'æben美'hɑːfɡr'æbenBNC¹⁷³⁹⁹⁵⁺² 基本例句 半地堑¹⁰⁰ The middle tectonic- sequence is the predominant source- reservoir combination in each half-graben or faulted- depression, and is also the important exploration target. 其中，中构造层序是盆地或凹陷的主力生、储油层系，也是盆地的重点勘探层序。 cnki