compressing and expanding 中文意思是什麼
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( 6 ) the relative motions of global plate tectonics are analyzed in detail with space geodetic and geological data. in addition, we find that the southern hemisphere is expanding and decelerating systematically, the northern hemisphere is compressing without a systematical change, and the whole earth is periodically fluctuating, which show global plate tectonic motion is asymmetrical
（ 6 ）詳細地分析全球構造板塊相對運動，並揭示了南半球在減速膨脹，北半球在收縮（但沒有系統性地變化） ，且南北半球在周期性震蕩等，反映了全球構造運動具有非對稱性。
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