凯瑟勒表示，在地质学历史上水下的甲烷释放曾发生过，有时是喷发，有时是千万年地丝丝泄漏。
Underwater methane releases have occurred in geologic history, sometimes as big burps of gas and sometimes as seeps lasting hundreds or thousands of years, Kessler said.
来自私人企业论坛的菲尔·麦凯布说：“学历的价值正在缩水。”
Phil McCabe from the Forum of Private Business said: ‘The value of a degree is dwindling.’
陈学凯，教授，西安交通大学人文学院历史文化研究所所长毕业于南开大学历史系中国古代史专业，获历史学硕士。
Chen Xuekai, was born in 1954. He graduated from Nankai University with the major of Chinese Ancient History in the History Department, and was granted the master's degree.
陈学凯，教授，西安交通大学人文学院历史文化研究所所长毕业于南开大学历史系中国古代史专业，获历史学硕士。
Chen Xuekai, was born in 1954. He graduated from Nankai University with the major of Chinese Ancient History in the History Department, and was granted the master's degree.
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