changed 测验 EN
- 问题 1 :
Not long ago, it was difficult to produce photographs of tiny creatures with every part in focus. That’s because the lenses that are excellent at magnifying tiny subjects produce a narrow depth of field. A photo processing technique called focus stacking has _______ that.
问题 2 :
The species may be a relict of former stages of historical vegetation and landscape development resulting from past climate _______ (glacial and post- glacial periods).