Part 2 字根 表示{行为动作}的字根 tract = pull 拉，引
入门字
attract (v.) 吸引
at(ad)/ tract
to/ pull
进阶字
1. traction (n.) 抓地力，拉力
tract/ ion
pull/ 名词字尾
This tire is so worn that it has no traction left, you'd better have it replaced.
这个轮胎磨损太严重，已经毫无抓地力，最好换掉。
2. tractor (n.) 曳引机
tract/ or
pull/ one who
The tractor can pull a lot of different machines to work the fields.
曳引机能拖曳各种不同的机器在田里工作。
3. contract (v.) 收缩
con/ tract
together/ pull
Metal contracts when coolde.
金属冷却时会收缩。
4. detract (v.) 减损
de/ tract
down/ pull
The figure skater's stumble did not detract from the artistry of her performance.
这名花式溜冰选手摔了一跤，但无损于她演出的艺术性。
5. detractor (n.) 贬低者
de/ tract/ or
down/ pull/ one who
Detractors of the candidate claim that he is involved in an extramarital affair.
贬低这位候选人的人指称他涉入婚外情。
6. distraction (n.) 令人分心的事务
dis/ tract/ ion
away/ pull/ 名词字尾
I can't study at home because there are too many distractions.
我在家读不下书，因为有太多令人分心的事务。
7. extract (v.) 节录，抽取
ex/ tract
out/ pull
The passage is extracted from Hemmingway's The Sun Also Rises.
这段文字节录录自海明威的《妾似朝阳又照君》。
8. intractable (a.) 难以管理的
in/ tract/ able
not/ pull/ able
The economy is bogged down by too many intractable problems.
经济被太多难以管理的问题拖累。
9. protracted (a.) 长时间的，拖延的
pro/ tract/ ed
forward/ pull/ 形容词字尾
Protracted civil wars devastated the small country.
漫长的内战使这个小国遭到大规模破坏。
10. retract (v.) 收回
re/ tract
back/ pull
Failing to produce any evidence, the candidate retracted his accusation that the incumbent had taken bribes.
这位候选人拿不出证据，只好收回他对现任官员受贿的指控。
11. subtract (v.) 减，扣除
sub/ tract
under/ pull
Scientists say that at five months, infants can already add and subtract.
科学家说五个月大的婴儿已经会加减。