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1·Nitrogen is an unstable element.

氮是一种不稳定的元素。

2·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。

3·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。

4·By working backward through a decay sequence, the scientists are reasonably certain they created element 118, even though the highly unstable new atoms survived only a millisecond apiece.

通过回溯一个衰变序列，科学家们有理由确认他们创造了118号元素，即便这种高度不稳定的新元素仅仅存在了一毫秒。

5·In the foundation of analyzing rainfall seepage mechanism, the finite element method is studied for unstable saturated-unsaturated seepage field.

在分析降雨入渗机理的基础上，研究了考虑降雨入渗影响的非稳定饱和—非饱和渗流场有限元分析方法。

6·In nature, the element, whose nucleus is unstable and will grows to be nuclear of other element, is called radioactive element.

在自然界，凡原子核不稳定，过一些时间自发地变成其它元素原子核的元素，称为放射性元素。