For decades astronomers have suspected the existence of a type of stellar explosion that is bigger still-a "pair-instability" supernova, with 100 times more energy than an ordinary supernova.

数十年来，天文学家们一度怀疑一种更寂静的恒星爆炸的存在——称之为“对不稳定”超新星，其能量超过普通超新星100倍。

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This particular fracture type, owing to its configuration and instability, poses significant challenges to the fixation method, especially in elderly patients with varying degrees of osteoporosis.

由于这种特殊的骨折类型的位置和不稳定，对固定方法造成了重大的挑战，特别是对伴有不同程度的骨质疏松症的老年患者。

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The results showed that (1) the type of the feedback contributed to the instability of implicit self-esteem.

结果发现：(1)反馈情境是影响内隐自尊稳定性的一个重要因素。

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