Lectures of Popular Scientific Knowledge
The Dr was teaching the knowledge about Salt
The Doctor was teaching the knowledge about Salt Lake to us, the part of which is a story about salt.
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Science knowledge lecture
|The students are making notes Carefully.||The Doctor was teaching the knowledge about Salt Lake to us.||All is listening to knowledge lecture.|
Science knowledge Lecture of Salt Lake
|This is the playbill we make.||The students are watching the playbills, It looks that they are very interesting in them..||Doctor Wu is giving a speech to us,and the students are listening carefully.|
Today, Dr. Wu, who works in the science and technology office of Salt Research Institute ,gave a science knowledge Lecture about salt to all the students and teachers of Grade 4 & Grade 5 in multi-purpose halls of our school. First, Dr. Wu introduced the ingredients of salt lake to us. Also introduced that each country was in seeks for the magnesium salt when Second World War, because the magnesium salt is the essential material in the atomic bomb and the hydrogen bomb. I also have known: The magnesium is the national defense metal (Dalisheng Missile), the lithium is the high energy metal, the boron is the high-energy fuel (rocket), we refine the lithium and the magnesium for China's national defense security, we seek for the boron for the aerospace high-energy fuel power. Really “, not listen , not know ,It is actually marvelous!”
The salt is essential for life and the diet life. Many lower animals can instinctivelly drink the lakes or lick soil to complete the salt life needs.
Various countries also have some different customs about salty, for example, the Japanese scatter the salt on the threshold in order to drive out the ghost; The Greek treat the salt as the daily necessity, while the essential Sacred Object.
Science knowledge Lecture not only widen my vision, but also enriched my knowledge.