变分原理 biànfēnyuánlǐ variational principle Definitions Defs Origin Strokes Stroke Words Sentences Sents 变分原理 變分原理 biànfēnyuánlǐ variational principle the variational principle in physics and mathematics
变分原理 變分原理 biànfēnyuánlǐ variational principle the variational principle in physics and mathematics
