单词：acoustically tunable optical filter
单词：acoustically tunable optical filter 相关文章
From VOA Learning English, this is the Health Lifestyle report. In parts of India, it is not uncommon to see people wearing a mask over their nose and mouth. The capital, New Delhi, has some of the world's dirtiest air. The pollution was a call for a
2018年VOA慢速英语(一)月
By Jessica Berman Washington 25 September 2007 Scientists say musical training appears to improve verbal skills. They explain that developing musical skills and learning to speak involve the same brain stem process, and that could help children with
2007年VOA标准英语（九月）
It was a great leap forward when cars got radios in 1929, then 8-track tapes then cassettes and finally CD players. But those seem downright quaint when compared with the entertainment amenities American drivers want today. And no wonderthe average
2005年NPR美国国家公共电台
China's Tibet Autonomous Region is about to achieve a universal coverage of fibre-optical broadband service ahead of its schedule. As China further rolled out its universal broadband project, Tibet's broadband service is looking to reach 98% of admin
2018CRI中国国际广播电台