中美20世纪后期的经济环境、传播条件等因素对中美广告设计主导观念演变具有重要影响。
Economical circumstances, propagation conditions and so on in China and the United States in later of 20'th century have important effect on the dominant ideas development.
初步探讨了人工饲养条件下白鱀豚声音传播与环境适应的关系。
The relationship between sound transmission and environmental adaptation of Lipotes vexillifer in captivity was preliminarily studied.
虽然在亚洲从未报告过该疾病，但因为当地有适宜疾病传播的条件，该区域也存在感染风险。
Although the disease has never been reported in Asia, the region is at risk because the conditions required for transmission are present there.
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