带屏伽玛取样加射仪

band, [bnd] n 带,条纹=strip;乐队;v 联合 【例】jazz band 爵士乐队We banded together against the robbers 我们联合起来对付强盗。 【类】stipple:dot=striate:band 有点的由点组成=有条纹的由条纹组成

发表于:2018-12-30 / 阅读(61) / 评论(0) 分类 不择手段背单词

By David McAlary The U.S. space agency, NASA, launched a satellite Saturday that scientists hope will help them locate the sources of mysterious gamma ray explosions, the brightest most energetic burs

发表于:2019-01-03 / 阅读(65) / 评论(0) 分类 VOA2004(下)--健康科技

By Alisha Ryu Mogadishu 05 January 2007 In Somalia, an alleged message from Osama bin Laden's deputy urging Somalis to launch an Iraq-style guerrilla war against Ethiopian forces there is being taken seriously by a now mostly-disbanded group of mili

发表于:2019-01-31 / 阅读(84) / 评论(0) 分类 2007年VOA标准英语(一月)

发表于:2019-02-01 / 阅读(65) / 评论(0) 分类 财会英语

It's a stat that gets bounced around as e-mail-forward wisdom: men think about sex every seven seconds. Even when the idea lacks this mythical specificity and grandiosity (that's 7,200 times a day!), the idea that men think about sex basically all th

发表于:2019-02-17 / 阅读(47) / 评论(0) 分类 阅读空间

natality 生育 fertility 生育率 fecundity 生育能力 birth rate, natality rate 出生率 births 出生人数 parity 胎次 premature birth 早产 life birth 活产 stillbirth 死产 birth peaks 出生高峰 mortality 死亡 mortality rate 死亡率

发表于:2019-02-18 / 阅读(56) / 评论(0) 分类 实用英语