烃类垂向运移是一个复杂的地质地球化学过程，严格受边界条件控制，在地质历史上具有一定的阶段性。
Hydrocarbon vertical micro migration is a complicated geological geochemical process. It is strictly controlled by boundary condition, possesses stages in geological history.
人类已进入了历史上的一个全新阶段。我们刚刚跨入21世纪的门槛，新千年的帷幕正在徐徐升起。
The human race has entered a completely new stage in its history. We have just crossed the threshold of the 21st century and the curtain of the new millenium is slowly rising.
人类已进入了历史上的一个全新阶段。我们刚刚跨入21世纪的门槛，新千年的帷幕正在徐徐升起。
Thee human race has entered a completely new stage in its history. We have just crossed the threshold of the 21st century and the curtain of the new millenium is slowly rising.
魏晋南北朝时期是中国历史上一个独特的历史阶段。
The Southern and Northern Dynasties in Chinese history is a unique historical stage.
魏晋南北朝时期是中国历史上一个独特的历史阶段。
The Southern and Northern Dynasties in Chinese history is a unique historical stage.
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