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沸く， わく
1. to grow hot (e.g. water), to boil
2. to get excited (at), to erupt (in applause, cheering, etc.), to be in a ferment, to take place energetically
3. to ferment
4. to melt (of metal)
变热(如水)，沸腾；爆发出(掌声、欢呼等)，沸腾起来；熔化(指金属)；发酵