In the case studies of clear-air layered echo in the Beijing area shows that the cloud layer clear-air echo located in atmospheric boundary layer, the main scattering mechanism suit for the Prague scattering with turbulence-scale ofλ/2.
对北京地区的层状晴空回波的个例研究表明,此次层状云晴空回波处于大气边界层内,主要散射机制符合湍流尺度为λ/2的布拉格散射。
参考来源 - 新一代天气雷达气象回波与非气象回波识别方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Some Finns see Mr Soini as a breath of fresh air. But others echo concerns elsewhere in the EU about his potential as a refusenik.
一些芬兰人觉得索依尼为芬兰带来了新鲜的空气，但是其他的欧盟成员国却担心其会成为一个“职业反对者”。
Bats are the only mammal capable of flying and are so highly evolved to be capable of pinpointing a single insect flying in the pitch black and plucking it out of the air using echo location.
蝙蝠是唯一会飞的哺乳动物，进化程度很高，能够在一片漆黑中精确定位一只飞虫的位置，并利用回波定位准确地从空中捕捉。
The carolling of Christmas songs echo through the air.
圣诞节的圣诞颂歌的歌曲在空中回响。
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