下列过程中发生了化学变化的是（　　）

    It can be dangerous to travel by sea. Ships sometimes sink(下沉) far away from land. When this happens, the sailors(海员) have to get into small boats. If another ship does not come and help them and they do not have enough food or water, they will die.
    Most people believe we must not drink sea water. They believe that if we do, we shall be very ill because of all the salt in the water. A doctor called Alain Bombard did not believe this. He thought that people could stay alive by drinking sea water and eating small fish, animals and plants from the sea. On 19 October 1953, he set out in a small boat to cross the Atlantic Ocean(大西洋). He did not take any food or water with him.
    Every day Dr. Bombard drank just a little sea water. He also caught fish and they had water in them. He drank this water. He could not cook the fish, so he ate them as they were. He took small plants from the sea, which gave him more food.
Dr. Bombard became hot, tired and quite ill, but after 65days at sea he was still alive. He traveled 2,750 miles from one side of the Atlantic Ocean to the other, and on 24th,December 1953, he reached Barbados.
    He lost 20 kilos, but he showed that people could live on sea water, the animals and plants in the sea.

看图并结合所学知识回答下列问题：
 
（1）图一是第一次工业革命中的一种动力机械，它的名称是？它的使用标志着人类进入了什么时代？
（2）图二是第二次工业革命中的重大发明，它的发明者是？在这次工业革命中，电力得到广泛应用，从而把人类带入到什么时代？
（3）如今，我们仍在享受着两次工业革命的成果，感受着科技神奇而巨大的力量，请举出一个实例说明科技的进步给人类生活带来的变化。
（4）科技是一把双刃剑。在造福人类的同时，如果处理不当，它会给人类带来哪些不利影响?

请对下面这段文字提供的信息进行筛选、整合，给“人类命运共同体理念”下定义。不超过70字

①人类命运共同体理念具有时代先进性。

②践行人类命运共同体理念，可以使世界实现持久和平、共享发展成果、实现持续发展。

③人类命运共同体理念作为各方都能接受的思路设计，追求公正合理的国际秩序。

④继承国际关系公认原则是人类命运共同体理念获得广泛认同的重要原因。