expansion of gases造句

• Pain on ascent may also result from the expansion of gas under a new filling , or from a dental cavity or abscess
  这是由于航机能使补牙蛀牙或牙疮内的空气膨胀而引致不适。
• Comparing among the adoption of condensation , supercondensation and high - effective catalyst technologies with the present status in china , this paper presents the conclusion of study the condensation tech is superior to the high - effective catalyst tech in revamping / expansion of gas - phase polyethylene plant , while the super - condensation tech should be further studied and developed before it can be applied in china
  摘要本文通过对冷凝、超冷凝及高效催化剂等技术分析比较，结合目前国内实际情况，阐明?在国内气相法聚乙烯装置扩能改造中应首选冷凝技术，其次是高效催化剂技术，而超冷凝技术还有待于进一步完善，目前不宜采用。