during-ancient-times
例句释义:1.The layer surface was of a wavy structure, probably due to the place being a sand dune during ancient times.该地层表面之形势呈波浪状走势，可能与古老形成之沙丘有关。
2.During ancient times, when the earth enjoyed a very warm and moist cpmate, the land was covered with large forests and big plants.在古代，地球经历了温暖、潮湿的气候，土地被大片的森林和高大的植物所覆盖。
3.A Brief Description about Medical and Hygeian Customs of Nations in Southeast Asia during Ancient times古代东南亚各民族医药卫生习俗述略
4.Study on the Damage Desert Vegetation in Oases Edge of Hexi Corridor During Ancient Times河西走廊历史时期绿洲边缘荒漠植被破坏考