使用价值的两重性指的是有用性和稀少性。
The duality of use value refers to its usefulness and rarity.
其稀少性使得对该损伤实施前瞻性随机研究变得非常困难。
Their rarity makes it extremely difficult to study these injuries in a prospective or randomized manner.
所有权的基础是稀少性，所有权的不同制度安排对资源的有效利用有很重要的影响和作用。
Ownership is based on scarcity and the ownership system has a very important effect on the using resources efficiently.
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