... ring of constants 常数环 ring of convergence 收敛环 ring of convergent power series 收敛幂级数环 ...
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Positioned as it is at the southern end of the Pacific "ring of fire", and at the convergence of the Indo-Australian and Pacific plates, New Zealand is a pretty seismic place.
新西兰地处太平洋火山带南端，且位于印度-澳大利亚板块和太平洋板块交界处，属于地震多发国。
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