单词:cathode-rays
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[00:04.05]第三部分 车祸伤员 [00:08.10]1.Tell me what your problem is. [00:21.12]告诉我你怎么不舒服? [00:34.14]2.Does it hurt when I press here? [00:45.73]我按这儿疼吗? [00:57.31]3.Though it's not very serious,you should rest in bed as much as possibl
Health Report - Mouth X-Rays and the Brain; Infected Gums Do Not Cause Heart Attacks This is the VOA Special English Health Report. A new study suggests that dental X-rays may increase the risk of the most common kind of brain tumor. However, experts
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Batteries of the future need to deliver more energy, and they need to be smaller. Researchers at MIT think they have developed a technology that can, a
As summer approaches we all enjoy outdoor activities. But with sunlight becoming more intense we should protect our skin from harmful direct exposure to the sun. 随着夏日的到来,我们都喜欢进行一些户外运动。但因为日照愈加强