如何设计对单一金属离子具有高选择性的冠醚，一直是人们所面临的具有挑战性的课题。
It is a challenge for people to design more highly selective crown ether for single metal ions.
立体选择性化合物的制备是当代有机合成化学中非常重要而且具有挑战性的领域之一。
The preparation of stereospecific compounds is an important and challenging area of contemporary synthetic organic chemistry.
从同一种底物出发，通过改变反应条件或修饰底物的结构实现选择性的合成不同结构产物，是一项非常有意义并有很大挑战性的研究课题。
The selective synthesis of different products from the same starting materials by simple subtle modification of structure or reaction conditions is an attractive challenge for chemists.
在丙烷氧化脱氢反应中，同时获得高的丙烷转化率和丙烯选择性是具有挑战性的研究内容之一。
It is a challenging research topic to obtain higher propane conversion and higher propylene selectivity at the same time in the reaction of propane oxidative dehydrogenation (ODH).
石油主要由还原型的碳氢化合物组成，因此它们的选择性氧化反应研究就成为化学工业中最重要的挑战性课题之一。
Petroleum primarily consists of reduced hydrocarbons, and their selective oxidation chemistry remains one of the foremost challenges in the chemical industry.
石油主要由还原型的碳氢化合物组成，因此它们的选择性氧化反应研究就成为化学工业中最重要的挑战性课题之一。
Petroleum primarily consists of reduced hydrocarbons, and their selective oxidation chemistry remains one of the foremost challenges in the chemical industry.
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