The ray approach is adopted to study the acoustic field in theory, and the ultrasonic experiment has been carried out in laboratory to model the underwater waveguide.

理论上采用射线近似方法分析了时间反转声场特性，实验上在实验室内开展了水下波导的超声模拟实验。

youdao

Establishing the growth model was an effective approach to study the growth law of forest tree.

建立生长模型是研究林木生长规律的有效手段。

youdao

The gravity model approach to international trade proves to be effective in the quantitative study of the geographical factors influencing bilateral trade.

国际贸易的重力模型方法对量化研究双边贸易中的地理因素是非常成功的。

youdao

In forecasts extending beyond the sample period used in the study, a stern test of any model, Mr Oswald's approach easily outperforms its rivals, including consensus predictions of commercial forecasters.

ECONOMIST: Oil and the new economy