重要

speed

The speed of something is the rate at which it moves or travels. ^{(移动、运行的) 速度}

noun [抽象名词]（运动）速度；（某事发生或进行的）速度；快，迅速；排挡，变速器；快门速度；感光度；照片曝光的时间；<非正式>安非他明；<古>成功，繁荣

The speed of something is the rate at which it happens or is done. ^{(发生、完成的) 速度}

verb [vt. 及物动词]快速移动；快速运送；超速驾驶；（使）加速，促进

If you speed somewhere, you move or travel there quickly, usually in a vehicle. ^{(通常指乘车) 迅速疾驰 • Trains will speed through the tunnel at 186 mph. 火车将以每小时186英里的速度快速穿过隧道。}

过去式	过去分词	现在分词
sped / speed	sped / speed	speeding

speed 出现在下面的课文中: Lesson 129&130 Seventy miles an hour speed 名词: 限速; Lesson 56 Faster than sound! speed 动词: 疾驶; Lesson 44 Speed and comfort; Lesson 72 A car called bluebird; Lesson 86 Out of control; Lesson 6 Smash-and-grab; Lesson 25 The Cutty Sark

vi. 加速，迅速前行；超速，加速；兴隆

单词造句:

疾驶

① v. 疾驶，急行

The police car sped past us.
The two men sped out of the room.

② n. 速度

at the speed of 以……的速度
The car goes at the speed of 40 miles an hour / at 40 miles an hour.在车后的 3 speed/4 speed 表示档位

speed up 速度的增加, 加速

slow down 减速

blow up 风力的增加