A common trait in eight names , what is it?

胡锦涛, 吴邦国、温家宝、贾庆林、李长春,习近平,李克强,He guoqiang, Zhou Yongkang,
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Nine oxen and two Tigers come out the cave, nine Paradoxornis II birds  into the wonderful bird nest (a word in English) - cursory reading people - ♂ 

九牛贰虎出山洞, 贰鴉九雀進妙巢 （一英文單詞） -走马读人- ♂    (169 bytes) (23 reads) 4/12/09 

•  警告! -走马读人- ♂    (71 bytes) (23 reads) 4/12/09

•  我使用代號: 贰--膩--精細的. -走马读人- ♂    (2483 bytes) (17 reads) 4/12/09

•  回复：我使用代號: 贰--膩--精細的. -走马读人- ♂    (51 bytes) (18 reads) 4/12/09

•  走马兄用心良苦，只怕是猜完这个谜，头发掉一半，所以不敢乱猜 -letstalk- ♂

Answer: fine? 马兄绝谜要怪猜，一夜白发染鬓腮；博引旁征声弘荡，江河湖海浩浩来！ To blame马兄must guess the mystery, night coming gills stained white; Bo primers next to levy Philip swing sound, mighty rivers and lakes to! 由newers
 
說破謎底我心驚， The answer that I break strikes
半生心血付他人,     Efforts to pay half for others,
收起錢包要開道， Wallet away to clear the way,
唉!                              Alas!
論壇留我心難定.      Forum set to remain difficult for my heart.