elusive
adj. 难以理解的,难以记住的;难以发现的,难以捕获的
例句
Smell, however, is a highly elusive phenomenon.
然而,气味是一种非常难以捉摸的现象。
Try to catch the elusive charm of the original in translation.
翻译时设法把握住原文中难以捉摸的风韵。
《新英汉大辞典》
Both of us are biologists, so we swerved to talk about the elusive chameleon.
我俩都是生物学家,便转而去讨论这难以捉摸的变色龙。