However, the detailed transient flow field, the originating mechanism and the potential application of unsteady tip clearance flow are unclear or not enough understood to date.
然而到目前为止，这种非定常波动的基本流动特征，形成机理及其潜在的应用前景都不够清楚。
2
The date when the customs release the goods shall be the day when the transporting vehicle which carries the export goods completes the customs clearance formalities.
海关放行货物之日指装载出口货物的运输工具办结海关手续之日。
3
You may pick up your visa within 90 days from the date of clearance shown above.