1.Now Nicholas Pepin from the University of Portsmouth, UK, and colleagues say deforestation could be an important part of the puzzle.
英国朴茨茅斯大学（UniversityofPortsmouth）的尼古拉斯•佩平（NicholasPepin）与其同事说，森林采伐可能是这道谜题的重要组成部分。
2.So until new work can model the exact process involved, Pepin says, "the jury will probably stay out. "
佩平说，因此在新的研究工作没有模拟出确切的相关过程之前，很可能不会有定论。
3.What is more, Pepin notes, solar gas once embedded in Earth's mantle may have been exhausted long ago.
Pepin还注意到更进一步的是，太阳气体一旦埋藏到地幔之中，很可能很久之前就已经耗尽。
4.Pepin Press Ancient Mexican Designs
古墨西哥设计素材