单词：Sphagnetum
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Its easy to think of computer as just machinery: buttons, screens and parts that work together. But the magic of computers comes from something makes them unique to you. This is Computer Software In Plain English. The problem with computers is that m
英语解说豆知识2009年
[00:00.00]Word list Unit 1_top 3 [00:03.37]单词表 第一单元 第三部分 [00:06.74]Can you guess my age? [00:08.19]你能猜我的年龄吗？ [00:09.64]can [00:11.23]能 [00:12.83]age [00:14.46]年龄 [00:16.09]zero [00:17.42]零 [00:18.76]one
北京仁爱英语
Broadcast: Jan 21, 2003 By Gary Garriott Drying food is a simple, low-cost way to keep food safe for eating. Drying removes water that small organisms use to break down food into other substances. Som
VOA2003（上）-社会广角
Alexander Graham Bell 亚历山大-格拉汉姆-贝尔 Can you imagine living without a telephone or a cell phone? 你能想像没有电话或手机的生活吗？ Until 1876, people didn't have phones. 直到1876年，人类才有了电话。 Many s
与美国小学生一起学英文第11册
Mutation 突变 Do you know about mutations? 你知道突变吗？ A mutation happens when the DNA structure in a gene changes. 当基因的DNA结构发生变化时就会发生突变。 Once a mutation happens, the change can't be reversed. 突变一旦
与美国小学生一起学英文第12册
Without the cell, they are nothing more than interesting chemicals. 没有细胞，它们只是有意思的化学物质。 But without the chemicals, the cell has no purpose. 但要是没有这些化学物质，细胞就毫无用处。 As the physici
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