2017年大学英语六级听力辅导材料
我们要振作精神,下苦功学习。下苦功,三个字,一个叫下,一个叫苦,一个叫功,一定要振作精神,下苦功。以下是小编为大家搜索整理的2017年大学英语六级听力辅导材料,希望对正在关注的您有所帮助!更多精彩内容请及时关注我们应届毕业生考试网!
Salt vs. Ice
食盐大战冰块
Y: Why does salt melt ice?
为什么食盐能让冰块融化?
D: It lowers the melting and freezing point of water.
是因为食盐将水的熔点和冰点降低了。
Y: Oh,,I don't get it. Doesn't that mean the salt make ice colder?
等一下,我不明白。这就意味着食盐让冰的温度变得更低吗?
D: Let me water freezes at thirty-two degrees Fahrenheit,right? At that temperature we can say that the rate of freezing is the same as the rate of melting.
我解释一下。纯净水的冰点是32华氏度,对吧?这个温度既是冰点也是熔点。
Y: So in other words, at water's freezing point there's a sort of equilibrium between freezing and melting.
也就是说,水的冰点就是结冰和融化的平衡。
D: wing salt on ice upsets the balance.
是的。在冰上洒盐扰乱了这种平衡。
Y: Upsets it how?
怎么打乱的呢?
D: The salt dissolves into the liquid water, which means that some of the water molecules are replaced by salt. Since there are now fewer liquid water molecules to be captured and frozen by the ice, the rate of freezing drops.
盐溶解在水中,就是说一部分水分子被盐取代了。既然结冰的'液态水分子减少了,冰点自然降低了。
Y: I think I get Since the rate of melting stays the same, there's more melting going on than freezing. And so the ice melts.
我明白了。水的熔点不变,融化的水分子比结冰的多,所以冰块就融化了。
D: Right.
对。
Y: Interesting.
很有趣。
D: In fact, anything that dissolves in water will do the trick. You could pour sugar on ice and it willmelt. But I guess since salt is cheaper it's used more often.
其实,任何溶于水的物质都可以使冰融化。把糖洒在冰上,冰也会融化。但是我想也许由于盐比较便宜,所以经常被使用
-
英语六级写作文科还是理科范文
在日常的学习、工作、生活中,大家总免不了要接触或使用作文吧,作文是一种言语活动,具有高度的综合性和创造性。作文的注意事项有许多,你确定会写吗?以下是小编精心整理的英语六级写作文科还是理科范文,仅供参考,大家一起来看看吧。英语六级写作文科还是理科篇1Directi...
-
2017大学六级考试词汇考前必练
Strengthaloneknowsconflict,weaknessisbelowevendefeat,andisbornvanquished.以下是小编为大家搜索整理的2017大学六级考试词汇考前必练,希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!pathetic引起怜悯的,可怜的,可悲的;令人生厌的,差距的pa...
-
2023年12月英语六级词汇选择题练习
词汇量不仅会影响四级的阅读和写作速度,也会影响听力的效果,因此,考生在平时的复习过程中应该加大词汇量的输入。下面是小编提供给大家关于英语六级词汇选择题练习,希望对大家的复习有所帮助。1.Startingwiththe________thatthereislifeontheplanetMars,thescienti...
-
2017年英语六级阅读词汇讲义解读
Aclearconscienceisasoftpillow.以下是小编为大家搜索整理的'2017年英语六级阅读词汇讲义解读,希望能给大家带来帮助!更多精彩内容请及时关注我们应届毕业生考试网!Perhapskeepingonesideofthebrainawakeallowsasleepinganimaltosurfaceoccasionallytoavoiddro...