【英语时差8,16】了解能量守恒定律（下）

Unlike the eight ball situation, the energy seems to have vanished! In fact, we now know that the energy merely changed forms. When the driver hit the brakes, what else happened? For one thing, there was a loud screeching¹ noise. That’s kinetic² energy being converted into sound waves. The brakes and the skidding³ tires became hot. That’s kinetic energy being converted into heat. Pebbles⁴ were knocked out of the way. That’s a mini-version of the billiard balls — kinetic energy being passed from one object to another. All these little outlets⁵ add up to exactly as much kinetic energy as the car had in the first place. It works out just the way the law of the conservation of energy says: energy can change forms, but can’t ever disappear.

1 screeching   

v.发出尖叫声( screech的现在分词 )；发出粗而刺耳的声音；高叫

参考例句：

• Monkeys were screeching in the trees. 猴子在树上吱吱地叫着。
• the unedifying sight of the two party leaders screeching at each other 两党党魁狺狺对吠的讨厌情景

2 kinetic   

adj.运动的；动力学的

参考例句：

• There exist many sources of energy both potential and kinetic.存在着许多势能和动能的能源。
• The kinetic theory of gases is the best known example.气体动力学理论就是最有名的例子。

3 skidding   

n.曳出，集材v.（通常指车辆） 侧滑( skid的现在分词 )；打滑；滑行；（住在）贫民区

参考例句：

• All the wheels of the truck were tied up with iron chains to avoid skidding on the ice road. 大卡车的所有轮子上都捆上了铁链，以防止在结冰的路面上打滑。 来自《用法词典》
• I saw the motorcycle skidding and its rider spilling in dust. 我看到摩托车打滑，骑车人跌落在地。 来自互联网

4 pebbles   

[复数]鹅卵石； 沙砾； 卵石，小圆石( pebble的名词复数 )

参考例句：

• The pebbles of the drive crunched under his feet. 汽车道上的小石子在他脚底下喀嚓作响。
• Line the pots with pebbles to ensure good drainage. 在罐子里铺一层鹅卵石，以确保排水良好。

5 outlets   

n.出口( outlet的名词复数 )；经销店；插座；廉价经销店

参考例句：

• The dumping of foreign cotton blocked outlets for locally grown cotton. 外国棉花的倾销阻滞了当地生产的棉花的销路。 来自《简明英汉词典》
• They must find outlets for their products. 他们必须为自己的产品寻找出路。 来自《现代汉英综合大词典》