salient angle造句

• Near the studied area , the fossil microtine show a sequence from the early pleistocene to the mid - late pleistocene : allophaiomys ( qi ) ? redromys ( q ) ? icrotus ( q2 - i ) - on their molars , the 5th dentine isthmus is5 show a closed trend from broad to narrow and made the salient angle tend to gradual increase . in the area , the 6th dentine isthmus is6 of the microtus show a trend from broad to narrow gradually
  在研究区及其附近，更新世以来，田鼠类的演替顺序为： allophaiomys ? ? predromys ? ? microtus ，其第5齿峡is5相应的由宽变窄，趋于封闭，使封闭的褶角趋于增多；研究区内microtusoeconomus的第6齿峡is6有逐步变小的趋势。