Part of the reason that art costs more than wallpaper is the expectation that it might appreciate in value.
原因之一是艺术品之所以比墙纸贵就在于人们预期艺术品会升值。
2
With increasingly expensive property prices, selling their property may not be a wise decision, so they just live together apart in expectationof a rise in their property's value.
房价还在不断上涨，出售房产可能不是明智之举。因此，他们只好住在一处，希望房产会继续升值。
3
The object matter of the foreword part is to describe the aim of this article, its research area and expectation, and its value both in practice and theory.