Gb	Eng
山口，隘口两个山峰间的通路或者山脊上的裂口	A pass between two mountain peaks or a gap in a ridge.
豚脊丘，陡峻的山脊由于对高斜层破碎山背的侵蚀而形成的陡峭的山背	A sharp ridge with steeply sloping sides, produced by erosion of the broken edges of highly tilted strata.