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1、,Unit 2 Sailing the oceans,Zheng He (1371-1433) made seven voyages during his lifetime and contributed greatly to the science of navigation in China.,Marco Polo (1254-1324), is probably the most famous Westerner to travel the Silk Road. His journey around Asia lasted 24 years.,Captain James Cook (17
2、28 1779) commanded three voyages of discovery for Great Britain, and sailed around the world twice.,modern navigational instruments,Compass,Astrolabe(星盘),Sextant(六分仪),Sea/Nautical chart,early navigational instruments,How did early seamen navigate so well?,Finding longitude, Finding latitude,Keeping
3、alongside the coastline, using celestial bodies, using wildlife, using the weather, using the sea,What is the use of a bearing circle, astrolabe, quadrant or sextant? ( ) What is the use of a compass? ( ) A. to set the course of the ship B. to measure the position of the ship C. to measure the speed
4、 of the ship D. to tell the time,Read the text carefully and choose the best answer.,B,A,We may well wonder how to plot The voyages of travelers navigational aids were not at the mercy of An early method of measuring speed involved The compass has a special magnetic pointer which Then he could tell
5、if he was sailing on his correct rather than random course. The earliest，the astrolabe, was a special all-in-one tool for However, it was awkward to use as the moving ship itself. The sextant was the updated version of the astrolabe and quadrant which,may/might well 很可能，极有可能 His appearance has chang
6、ed so much that you may well not recognize him. You might well find that youll need more food and drink by the weekend. plot 标绘，追踪的位置 He was bent over the table, plotting a new course.,We may well wonder how seamen explored the oceans before latitude and longitude made it possible to plot a ships po
7、sition on a map,The voyages of travelers before the 17th century show that they were not at the mercy of the sea even though they did not have modern navigational aids., at the mercy of 任由摆布；在面前无助 They were lost at sea, at the mercy of wind and weather. I dont like to be at the mercy of such a man.,
8、An early method of measuring speed involved throwing a knotted rope tied to a log over the side of the ship,involve (v.)需要；应当(包括) Winning the game involves both skill and fortune. knot C (绳等的)结 make / tie a knot 打结 a log: a thick piece of wood,The compass has a special magnetic pointer (which always
9、 indicates the North Pole), so it is used to help find the direction (that the ship needs to go).,magnetic adj. 磁的, 有磁性的, 有吸引力的 magnetic field U 磁场 magnetic pole C 磁极 The iron has lost its magnetic force. 磁力 a magnetic person 有魅力的人,make a random choice 任意选择 a random sample 随机的抽样 at random 任意地，随便地 Th
10、e killer seems to have killed people at random.,Then he could tell if he was sailing on his correct rather than random course.,random n. 随意, 任意 adj. 任意的, 随便的, 胡乱的,The earliest，the astrolabe, was a special all-in-one tool for telling the position of the ship in relation to the sun and various stars w
11、hich covered the whole sky,I have some comments to make in relation to this matter. The library is quite small in relation to the total population of the town.,关于,和相比,However, it was awkward to use as one of the points of reference was the moving ship itself.,The camera has a lot of buttons, which m
12、akes it awkward to use.,He is awkward; he keeps dropping things.,There was an awkward silence, when no one knew what to say.,An awkward situation arose during the peace talks.,难使用的,笨拙的,尴尬的,棘手的,The sextant was the updated version of the astrolabe and quadrant which reduced the tendency to make mistakes.,tendency n. “倾向，趋势” have a tendency to /towards 有的倾向 I have a tendency to talk too much when Im nervous. My grandma has a strong tendency to forget things.,update v. 更新，使成最新 to update the software,Homework,1. Review this passage. 2. Preview Learning about language.,Goodbye,