中学英语单词细节知识点复习sweep和swing和symbol等

中学英语单词细节知识点复习sweep和swing和symbol等
sweep (swept, swept) [swiːp]
v.清扫；清除
The owner of the store was sweeping his floor when I walked in.当我走进商店的时候, 店主正在扫地。
短语：1.sweep sth (from ,off , into ,away ,up)扫，掸，打扫
2.Sweep ...out 打扫干净

sweet [swiːt]
n.[C，U] 甜点，糖果 ‖ adj. 甜的；芳香的
The fruit isn't sweet enough.这水果不够甜。
Don t eat sweets.不要吃糖果。
短语：1.have a sweet tooth爱吃甜食
2.keep sb sweet 讨好某人
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swim (swam, swum) [swɪm]
v.游水；游泳
She learned to swim when she was really tiny.她很小的时候就学会了游泳。
短语：1.go for a swim
2.go swimming 游泳

swing [swɪŋ]
n. [ C ] 秋千 ‖v.晃动；摆动
You've been on the awing for ten minutes, it's my go now.你荡秋千有10分钟了，现在该轮到我了。
e.g. The golfer took a swing at the ball. 打高尔夫的人挥棒击了一下球

symbol ['sɪmb(ə)l]
n. [ C ]象征；标志
White has always been a symbol of purity in Western cultures.在西方文化中，白色一向象征纯沽。【a symbol of sth.……的象征〕
短语：1.symbol of courage勇气的象征，标志
2.Symbol for sth符号，标志
e.g. AU is the chemical symbol for gold. AU 是金的化学元素符号。

system ['sɪstəm]
n. [C, U] ①体系，系统; ②制度, 体制
Not only this system but that one needs widening out, too.
不仅仅是这个系统，那个系统也需要扩充。

Shooting down an ice-covered track, a bobsled can go faster than 80 miles an hour. ____16____ The answer is a combination of athletics and science.
At the start of a race, the crews push their sled, building up speed before they jump in for the ride. For months before the race, the crew members have built up explosive power in their legs. That means doing a lot of jumps, and sprints. It also means pushing heavy sleds! The push is the crew's only chance to add speed. ____17____
The design of the sled's runners (滑板) reduces their friction with the ice. ____18____ They may not melt enough ice fora fast ride. Runners that are too rounded may become too warm softening the ice and slowing the sled down.
____19____ The rules state that all runners must be made of the same type of steel, and crews may polish them using only approved materials. Before each race, officials check the temperature of the runners. Runners may not be more than a few degrees warmer than the ice. ____20____
But remember the sled must not be too fast — the crew still needs to be able to reach the bottom safely.
A. Why do people go for the sport?
B. Crews polish their runners for a fast ride.
C. The riders sit inside a hard shell, called cowling.
D. How do bobsleds go faster than cars on a highway?
E. A hot runner will melt more ice and may possibly go faster.
F. Runners that are too flat would spread the friction over a wide area.
G All other work goes into keeping other forces from slowing the bobsled down.