And under the condition of propagating against weak wind, most of medium-scale gravity waves can reach observation height.

而在弱逆风作用下，大部分中尺度范围重力波都能够传播到观测高度。

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Under the condition of propagating along strong wind, large number of waves cannot reach the observation height, due mainly to critical coupling.

在强顺风场作用下，由于风场引起的捕获，大量重力波不能传播到观测高度。

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By using observation data over 50 years, the paper systematically analyzed the relations of different stand density with diameter, height, crown of trees and so on.

利用近50年的系统定位观测资料，分析红松果材兼用林不同林分密度与直径、树高、冠幅等主要测树因子的关系。

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The pair will soon begin an intense observation campaign that will pin down the variation in height across the globe to an accuracy of better than two metres.

BBC: German radar satellites fly tight space waltz

One example of continuous observation of ecological change is provided by the Nenets in Northwest Russia, who report increases in the height of willow and alder shrubs in the tundra zone.

UNESCO: EDUCATION