Due to the large size of the deaerator water tank of a nuclear power station, in-situ welding is required for 2 ring butt welds, causing difficulties in welding and heat treatment.

某核电站除氧器水箱尺寸较大，其2条环焊缝需在现场拼焊，焊接和热处理难度很大。

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The resulted D, L-lactide and glycolide were found to have ring structure by fourier transform infrared spectrometry and proton nuclear magnetic resonance(1H NMR) spectrometry.

通过傅立叶红外光谱和氢核磁谱（1H NMR）测试表明所合成的丙交酯和乙交酯具有环状结构。

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Structute of nitrogen heterocyclic ring quaternary ammonium salt cationic surfactants was identi fied by mass spectrography, nuclear magnetic resonance spectra, infrared spectra and etc.

用质谱法、核磁共振波谱法、红外光谱法等，确定了未知氮杂环季铵盐型阳离子表面活性剂的结构。

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It was during a visit to Islamabad last October, however, that U.S. Deputy Secretary of State Richard Armitage provided Musharraf with the CIA's evidence of the nuclear smuggling ring run by Khan, according to Pakistani officials.

CNN: CIA 'sparked Pakistan nuke probe'

The physics machine, called the Large Hadron Collider, is a 17-mile hollow ring underneath Switzerland and France built by CERN, the European Organization for Nuclear Research.

FORBES: Taking Bets On The Large Hadron Collider