科学60秒:为何小孩走不了远路
If you’ve ever had to pick up and carry a tired child through the mall, you know that walking sometimes the toddlers. Now scientists think they know why. The results appear in the Journal of Ex...
英语入门听写:两个笨贼
:Very Stupid Robbers 两个笨贼 笑话Two robbers were robbing a hotel. The first robber said, "I hear sirens. Jump!" The second one said, "But we're on the 13 th floor!" The first one screamed bac...
短文听写:成功之道
短文The Road to Success It is well that young men should begin at the beginning and occupy the most subordinate positions. Many of the leading businessmen of Pittsburgh had a serious responsib...
太阳能热水器 (1)
AfghanistanSolar water heaters are devices that use energy from the sun to heat water. Solar water heating is used around the world. The solar water heater described here is based on a design de...