(b, d, g, z, v, zh, j), the preceding vowel is said more slowly, and on a double stairstep.

（b、d、g、z、v、zh、j）的辅音，前面的元音说得更慢， 而且是双阶梯。

It's a combination of vocal placement and cadence. This means a throaty sound and a stairstep intonation.

它们受发声位置和节奏，也就是喉音和阶梯状语调的共同影响。