When they are pronounced, no pause of phone before them, and no fixed accent in themselves.

发音时前面不能出现语音的停顿，而且本身没有固定的重音。

youdao

In a strong French accent he told the swells he hailed from the little-known Gallic branch of the famously fixed family whose members have graced every Forbes 400 list since its 1982 inception.

FORBES: The Fakes