They are opened and sustained in the open position by the force of velocity pressure, and closed by the force of gravity. 他是利用流體速度壓力來開啟和保持在開啟的位置，並利用重力的作用來關閉。
You are now ready to develop wind pressure diagrams for a simple rectangular building. 現在你已經準備好計算一個簡單的長方形建築的風壓圖表。
The development of the code-based wind pressure diagrams, which are discussed in the next section, required many simplifying assumptions about these complex issues. 在下節討論的，基於規範的風壓圖表的開發，需要許多對這些複雜的問題簡化假設。
For the velocity survey the pitot-static tube is moved around the jet, and the dynamic pressure is measured at numerous stations. 為了測量速度，可把皮托靜壓管放在試驗段內各個地方並測量多點上的動壓。
Gusts can cause variations in the test section dynamic pressure, and in the distribution of dynamic pressure across the test section. 陣風會使試驗段動壓和試驗段截面動壓分佈發生變化。
