美国官员说，他们一直密切注视叙利亚在黎巴嫩边界一带的军事活动。
S. officials say they have been monitoring Syrian military activity along the Lebanese border.
山西断陷带的断层形变速率最高，是华北地区最重要的活动块体边界；
The Shanxi graben zone has the largest fault deformation rate showing it is the most important block boundary of North China.
从各边界带上强震活动的频次和单位时间、单位长度的地震应变能释放出发，讨论了各活动地块边界带的强震总体活动水平；
The seismicity levels on the active tectonic block boundaries are discussed considering the large earthquake frequency and the released strain energy in unit distance and time.
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