这个过程可能周而复始，周期性地重复--天文学家称之为"脉动"对不稳定性超新星--直至恒星失去足够的物质，在普通超新星的形态中走到生命的尽头。

The cycle can repeat itself in pulses—astronomers call this case a “pulsational” pair-instability supernova—until the star loses enough mass to end its life in an ordinary supernova.

youdao

现代长江口、黄河口水下三角洲地区的海底上发育有大量规模形态各异的不稳定性现象。

There are a great many different scale and shape unstable features developed on the subaqueous delta of the modern Changjiang River and Huanghe River.

youdao

利用数值模拟，研究了不同条件下赤道电离层等离子体交换 不稳定性的演变和扩展F不均匀体的形态。

We have performed numerical simulations of nonlinear evolution of plasma interchange instability in equatorial spread F (ESF) under different conditions.

youdao