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- 709322
- 在线时间
- 小时
- 注册时间
- 2012-1-9
- 最后登录
- 1970-1-1
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1:46
Typically, glaciers are known to erode surfaces and transport sediment
but study suggests that the glaciers can protect the mountain from erosion
1:59
a study show that there is less erosion under coldest glaciers
but the role of glaciers will change with the increasing temperate
2:21
a achievement of transplanting cells to replace the damage organ make a new direction of transplanting tissue into humanbody
they find that mixture of two type of livers can from a liver buds then put them into animal body ,then they find that it is useful
2:11
cells can develop in many organs but it is diffcult to develop in V,
and there are another two problem:1 safety problem 2 practical problem(recent techque is not advanced to make a breakthrough in automated cell proliferation)
2:20
the high water content of cloud is due to the launch of rocket
give date to prove
6:5
introduce a topic how many people are bited by shark 提出现象
who should people do to reduce the risk of attack :1 weather 2 environment 3 what should we do 提出解决方法
what grovernment should do :1 convey information 2 ask people to swin close the shore 3 information about shark 解决方法
response to shark bites
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