speed
as a noun.,
1、it means the rate at which sb./sth. moves or travel.
eg: when we cross the road, we should reduce our speed.
2、the rate at which sth. happens or is done.
eg: we try to increase the speed of delivery.
3、the time taken by a camera shutter to open and close.
eg: shutter speeds.
4、a gear on a bicycle, in a car,etc.
eg: a ten-speed mountain bike.
我们从上面speed这个单词的英语解释和例句可以知道：speed 做名词时有以下意思：
（运动的）速度、速率；（发生或进行的）速度、进度；快门速度；拍档、档位。
speed
as a verb.
- to move along quickly
eg: the boy sped away on his bike when meeting his teacher.
2.to take sb./stth. somewhere very quickly, especially in a veicle.
eg: the taxi speeded them into the ceter of the city.
3.to make sth happen more quickly.
eg: this kind of exercise will speed his recovery.
从上面的例句我们知道，speed 作动词时有以下含义：
快速前进；快速运送；加速，促进。
词汇，对于大部分学生来说，是学习英语的第一大难关，特别是到了高中以后，不同文本对同一个词汇的内涵挖掘不一样，这就让相当大一部分学生只了解词汇的基本含义后在遇到相关引申后就一头雾水。
因此，对词汇意义的精准把握是我们需要高度重视的事情。那么我们到底应该怎样做呢？
在我看来，学习英语词汇一定要从该词汇的英语解释入手，只有弄懂英语解释，我们才能了解该词汇的真正内涵。
其次，多在语篇中或者例句中去理解和感悟新学的词汇而不是干瘪瘪的背诵。
