n. tautomerism ; enantiotropy
vt. tautomerizing
化学结构计算机处理中最常遇到的困难是互变现象、交替键和芳香键的处理。
The most usual problems encountered in the structure handling are tautomerism, alternating and aromatic systems.
俄罗斯社会的剧变直接或间接地反映到语言中，语义互变现象十分活跃，其中最突出的是词的修辞色彩的变化。
The dramatic change of Russian Society is directly or indirectly reflected in the Russian language. A dominant phenomenon of the active Semantic interchange is the change of verbal rhetorical color.
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