LIU Shuguang. Study on pelletizing, oxidizing and roasting performance of ji dong iron concentrate [d]. Tangshan: School of Metallurgy and Energy Resources of Hebei Polytechnic University, 2006.

[2]刘曙光。冀东铁精矿粉造球、氧化及焙烧机理的研究[D]。唐山：河北理工大学冶金与能源学院，2006。

youdao

JI Qiang. Design of Integrated Transmission System Performance Testing Bench for Endless-track Vehicles[D]. Shand ong: Shand ong University , 2011.

[2] 冀强。 履带车辆综合传动系统性能试验台的设计[D]。 山东： 山东大学， 2011。

youdao

And I'd always just hear him say "ji-geum", so I just started to say that word.

我经常听他说“ji-geum”，我现在也经常说这个词了。

关于旧金山大学校园 - SpeakingMax英语口语达人