Greg Hall is a world famous geologist who ever worked as Chief Geologist for Placer Dome. Mr. Hall has more than 10 years working experience in China.是什么意思_Greg Hall is a world famous geologist who ever worked as Chief Geologist for Placer Dome. Mr. Hall has more than 10 years working experience in China.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句