There are three major objectives of media research:(1) obtain knowledge about the educational or instructional effectiveness of a chosen medium;

大众传播研究有三个主要目标：（ 1 ）获得对被选择的媒体的教育或指导效力的了解；

youdao

Even there, English was often chosen as the medium of education in preference to the inhabitants' mother tongues.

即便在那里，他们也更青睐于选英语作为教育的语言，而不是他们的母语。

youdao

Neutral medium, it should be chosen for the copper alloy shell material valve solenoid valve, or valve shells falling debris often rust, especially the movements do not frequent occasions.

中性介质，也宜选用铜合金为阀壳材料的电磁阀，否则，阀壳中常有锈屑脱落，尤其是动作不频繁的场合。

youdao

But trying to pin down national identity is always a difficult and dangerous occupation - even more so if your chosen medium involves marshalling 1, 000 people, nine geese and 70 sheep on a sports field.

BBC: A defining moment for Britain