Nitrogen is an unstable element.

氮是一种不稳定的元素。

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The yellow shirts have been stoking nationalist feeling with heated rhetoric about border clashes with Cambodia, adding another unstable element to an already volatile mix.

黄衫军夸大泰国与柬埔寨的边境冲突，以激烈的言辞煽动民族主义情绪，这无疑是给本已不稳定的情势火上浇油。

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Each element has at least one isotope with unstable nuclei that can undergo radioactive decay.

每个元素至少有一个同位素不稳定原子核可以进行放射性衰变。

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Being a company of utter geeks, Google called this beta test laptop the Cr-48 after the chemical name of an unstable isotope of the chrome element.

FORBES: Names You Need to Know: Cr-48

In the short term, it adds another volatile element to a dangerously unstable mix.

ECONOMIST: Ulster��s past, Ulster��s future