这本身就是一个几乎难以理解的跨越几代人的过程，这使得澳大利亚的岩石艺术成为世界上最古老的持续的艺术传统。
This in itself is an almost incomprehensible span of generations, and one that makes Australia's rock art the oldest continuous art tradition in the world.
在软件方面，估算仍是一种玄妙的“黑色艺术”，因为对于如此复杂的耦合和交互网络，实在是难以理解，因而也难以分析。
Estimation is still somewhat of a black art in software precisely because it's difficult to understand, and therefore analyze, this complex spider web of coupling and interaction.
泰特美术馆眼下举办的美术展中，一位令人难以理解的美国艺术家塞•托姆布雷，他被泛称为后抽象表现主义者，其所参展的作品大都是不被人们熟悉的。
MANY of the most delightful pieces in the Tate show of art by Cy Twombly, an elusive American artist commonly described as a post-Abstract Expressionist, are among his least familiar works.
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