奖学金通过公开的全国竞赛选拔学生。

Students are selected for scholarships ___by ___means ___of an open, national competition.

Voiceover CD的另一个优点是教师可用性，他们可以通过电话轻松联系，但这种服务昂贵。

Another plus of the Voiceover CD is the availability of teachers, who can be easily reached ___by ___means ___of a telephone, but this kind of service is expensive.

公司通过视频会议与国际客户沟通。

The company communicates with its international clients ___by ___means ___of video conferences.