单词：spirifer
genus Spirifer, or Delthyris, and allied genera, in which the long
calcareous supports of the arms form a large spiral, or helix, on each
side.
单词：spirifer 相关文章
SCIENCE IN THE NEWS - January 29, 2002: Aspirin By Nancy Steinbach VOICE ONE: This is Sarah Long. VOICE TWO: And this is Bob Doughty with SCIENCE IN THE NEWS, a VOA Special English program about recen
科技之光
Lois has a headache. The headache started one hour ago. She doesnt know why she has a headache. She never gets headaches. She never gets sick. Lois is a healthy woman. Where did her headache come from? Was it something she ate? Was it something she d
超级简单英语阅读
By Noel King Goma, DRC 22 November 2007 Food prices are skyrocketing in eastern Congo's volatile North Kivu province as Laurent Nkunda's rebels and the Congolese army engage in what aid workers and the United Nations are calling a game of stopping an
VOA常速英语2007年（十一月）
HEALTH REPORT – November 13, 2002: Aspirin After Bypass Surgery By Jerilyn Watson This is the VOA Special English Health Report. A new study says the common drug aspirin greatly reduces life-threate
健康与环境
Be still, said Jack. Jack and Annie stood frozen as an elephant steppedout of the shadows. It waded into the pond anddipped its trunk into the water. Oh, wow, said Annie. Jack breathed a sigh of relief. An elephant wasn'tgoing to chase them and eat t
汪培珽儿童英文分级书单《神奇树屋》