Following population growing and human activity bigger and bigger, the distribution of wild vascular bundle is gradually changing in Beijing.
随着北京地区人口的增多，人类活动范围越来越大，野生维管束植物的分布也逐渐发生了变化。
Human body movements are achieved through muscle contraction and relaxation of this activity changing in the strength or length.
人体各种运动都是通过肌肉收缩和舒张这一活动产生力量或长度的变化来实现的。
The underlying surface conditions of Loess plateau area have been changing great because of human activity, which results in affecting the features of producing run-off and conveying sand.
在人类活动的影响下，黄土高原地区的下垫面条件发生了很大变化，这种变化影响了流域的产流输沙特性。
The underlying surface conditions of Loess plateau area have been changing great because of human activity, which results in affecting the features of producing run-off and conveying sand.
在人类活动的影响下，黄土高原地区的下垫面条件发生了很大变化，这种变化影响了流域的产流输沙特性。
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