But the friction and heat wears away at the space rock, the hot air actually melts the metal surface, and often the collision with the atmosphere can have a shattering effect, splitting the meteorites along fissures. This is an actual meteorite, and

发表于:2018-12-03 / 阅读(39) / 评论(0) 分类 探索与发现2014年

It might be the cheeks flushing with embarrassment or a voice choking with emotion. Our physical reactions can reveal what we truly feel. And some think they can show when someone's lying. Typically when a person tells a lie, they begin to sweat. I'

发表于:2018-12-30 / 阅读(130) / 评论(0) 分类 国家地理2008年

Like these sea fans, the last frontier of life on the reef. The divers reach their target-- a massive ridge, 190 feet down. Here, the air they are breathing is under pressure, squeezed down so that there's more gas in every lungful. They have to hope

发表于:2019-01-22 / 阅读(45) / 评论(0) 分类 自然百科2011年

shows it really quite well. In order to bring back a piece of this mystery, his team of divers will be risking their lives. Diving problems, you got currents, tides, waves. We havent been here before. We haven't been this deep, though. One of those c

发表于:2019-01-22 / 阅读(42) / 评论(0) 分类 自然百科2011年

351. odd a. 奇特的,古怪的;奇数的 352. omit vt. 省略 353. opponent n. 敌手,对手 354. opportunity n. 机会,时机 355. orchestra n. 管弦乐队 356. semester n. 学期;半年 357. se

发表于:2019-02-03 / 阅读(211) / 评论(0) 分类 英文语法词汇

PC:个人计算机Personal Computer CPU:中央处理器Central Processing Unit CPU Fan:中央处理器的散热器(Fan) MB:主机板MotherBoard RAM:内存Random Access Memory,以PC-代号划分规格,如PC-133,PC-1066,PC-2700 HDD:硬

发表于:2019-02-18 / 阅读(74) / 评论(0) 分类 实用英语