This means that the lowest mass black holes may be very rare, short-lived or non-existent, creating a conspicuous gap between the most massive neutron stars and the least massive stellar black holes.

也就是说，那些最小的黑洞恐怕真是转瞬即逝或者压根就没存在过。这使得最大的中子星与由最小质量恒星产生的黑洞间存在巨大的差距。

youdao

This was based on the assumption that SMBHs form in a similar way to stellar-mass black holes, marking the final phase in the lifespan of massive stars that have exhausted all their fuel for fusion.

这是以大多超大质量黑洞形成过程与恒星质量的黑洞的形成过程类似的假设为基础的。 这种黑洞的形成通常在大质量恒星的生命过程的最终阶段（用尽了用于核聚变的所有燃料的时期）。

youdao

Those unseen and isolated stellar mass black holes that could lie almost as close as the nearest stars.

FORBES: Free-Floating, Nearby Black Holes Detectable By Decade's End, New Study Reports