Volcanic activity has created thermal springs and boiling mud pools.

火山活动产生了温泉和沸腾的泥浆池。

《柯林斯英汉双解大词典》

Still central to Rotorua's tourism offering is its accessibility to thermal activity such as hot-water geysers and boiling mud pools, plus the opportunity to engage in Maori culture.

当前，罗托鲁瓦旅游业的主导核心仍然是与地热相关的各式活动，游客不仅能体验近在咫尺的热水间歇泉、沸腾泥浆池，还能有机会与毛利文化作近距离接触。

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Enzyme immobilization has been proven an effective method to improve catalytic activity and thermal stability of enzyme.

酶的固定化已经证明是提高酶的活性和热稳定性的有效方法。

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"We can continuously observe and record the activity at the summit craters using our Web cams and thermal cameras, which send the images direct to Catania, " Calvari told CNN.

CNN: Keeping track of Etna's pulse