People usually spend a year or so for their graduate exhibition, but Western clothes to me were already so familiar and I found it difficult to perceive them as pieces of work.
我们一般要用一年去准备毕业展览。
Orientation can be difficult to perceive with some shapes or at small sizes, though, so it's best used as a secondary communication vector.
在某些形状下，或者尺寸较小时，方位是比较难以察觉的，因此它最好作为次要的传达矢量。
Abstract: as a kind of karsts, geological one has no regularity and hard to perceive directly etc, has been is the foundation for design and construction of difficult problems.
摘要：溶洞作为一种不良地质具有无规律性且难以直观察觉等特点，一直以来是基础设计及施工的难题。
应用推荐