单语范例（未经PONS编辑处理）
英语
- This does fit a pattern one would expect from genetic drift, but there seem to be no geographical or ecological barriers restricting gene flow.en.wikipedia.org
- But after this point, movement around the planet became much more rapid, and even traversed major ecological barriers and events.www.wired.co.uk
- The results suggest that weather conditions can really act as obstacles during migration, and thus, besides ecological barriers, the migratory behaviour of birds could also be shaped by "meteorological barriers".www.wildlifeextra.com
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