托福听力每日一练第27天：
演讲听写训练1：
OK. We’ve been talking about mechanics and then we still have a few minutes. Let me tell you about ancient Greek and what they thought about mechanics. They came up with a … for them to describe different motions in different materials. in more than 2000 years ago, Aristotle, the ancient Greek philosopher, assumed that all the matter on earth were made up with four substances, earth, water, air and fire. Under his system, earth is the densest, water is the next, air is less dense than water and fire is least dense of all. The heaviest object remains of earth and water, and lighter object contains significant amounts of fire or air. So in Aristotle's ..., different types of matter have different characteristics. He assumes this was because different types of matter were composed of different amounts of four primary substances. And Aristotle believes that the motions of objects could also be explained by the basic natures of four primary substances. eh, for example, there are basic motion of up or down. Aristotle noted that when he released most objects, they would drop downward. But he also knew that something could ...upward, like smoke.
Aristotle considered an object downward or upward motion to be the result of dominant nature of the object. So according to Aristotle, matter like rock were primarily composed of earth, therefore, they naturally want to move toward the center of the earth because this was all thing earth rested. But fire had a different a resting place, the sky. So smoke would naturally rise when it was released because it was driving toward its natural resting place.
演讲听写训练2：
Hi, I'm Jim Black. Before you get to start the class today, Doctor give me a few minutes to talk you about the biology department's ongoing turtle watching project down the south beach. As many of you probably know, south beach is an important nesting site for the green turtle....in the next few days, turtles from several nesting sites along the beach will hatch ahead the water. the problem is that a lot of this hatching will never make it, rackles and hungry birds will get many of them before they reach the ....so we have a 24-hour watch going on now, so the volunteers will be on hand to protect the turtles after they hatch. Oh, we also need someone to notify the owners of the beach to leave their yard ...for the next couple of weeks. The baby turtles are tracking artificial. In fact, some of them end up in the beach highway and killed by passing cars. So we are tracking and minimize beach. Now if you are interested, please stop by my office in the biology department and sign up. What we ask you to do, we are asking for at least two-hour commitment for each participant. Oh, and please note, the turtle-watching activities do not constitute excuse of absence from class. Thanks.
演讲听写训练3：
Well, on the topic of ...technology has made..., I’d like to spend a few minutes on the ice industry, one of the major industry in the 1800.now, before refrigerators come to common use, people in rural areas often have a ware or a spring house to keep perishable fruits fresh...huge one, but a spring house was a small house that people would build over a spring. Farm families then rely on cool water from the spring to help keep their products or meat cool....boxes instead and they bought a lot of ice, put in these ice boxes and they packed all the milk or meat inside to keep them fresh. So until refrigerators..., the ice industry supplied city dwellers with these blocks of ice. Now, by 1800, people have learned how to harvest blocks of ice from lake and cut these ice with... and storing. These ice houses are enormous, among the largest structures anywhere in the country at that time. They are so important that they often had rail tracks going right up next to them. In addition to being transported by train, ice was delivered by ships all along the east coast or further inland by ...boat. Eventually, the industry supplied blocks of ices to almost any place in the country where people could afford such luxury.
