So it becomes very necessary to study the wind load effect on the tower and mast structure.
因此对塔桅这类特型结构进行风荷载研究很有必要。
In such case, it becomes very necessary to have a prediction of future rate of return in order to get a clear picture in making precise decision.
在这种情况下，它变得非常必要预测未来的回报率，以获得清晰的图象，做出准确的决定。
It becomes very urgent and necessary to probe in and establish a set of effective, scientific, systemic and normative mechanism of management, education and correction in a long run.
探索和构建一套长期有效、科学、系统、规范的管理，教育、改造机制势在必行。
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