I used to say ZH, but now it's always BeiJing.

我以前说 ZH，但现在就会说 BeiJing。

(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。

You'll also commonly hear the capital of China pronounce BeiZHing with a ZH sound instead of with a J sound that is both written in English and pronounced in Mandarin.

你还会经常听到中国首都被读成是 BeiZHing，带 ZH 音而不是用英语书写和中文拼写的 J 音。