快活和歇斯底里间的界线十分模糊。
There's a very thin dividing line between joviality and hysteria.
冷空气一侧的边界常常十分模糊，特别是在地表附近。
The boundary on the cold air side is often ill-defined, especially near the surface.
善恶在《科学怪人》和《泰比》中的冲突十分模糊。
In Frankenstein and Typee, the conflicts between good and evil are ambiguous ones.
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