友情提示：看不懂音变的同学请听203-206期

pedal ped-foot
A foot-operated lever used for actuating or controlling a mechanism, as in a loom, sewing machine, piano, or organ. A similar foot-operated part attached to a crank and used for powering various devices, such as a bicycle.
Of or relating to a pedal.
Of or relating to a foot or footlike part
To use or operate a pedal or pedals.
To ride a bicycle.
n. 踏板；脚蹬子
vt. 骑（自行车）；踩……的踏板
adj. 脚的；脚踏的

例句:
He pushed hard on the brake pedal to avoid a collision.
他使劲踩下煞车踏板以避免撞车。
I saw him pedal to school every morning.
我看到他每天早晨骑自行车上学。

peddle
To travel about selling (wares): peddling goods from door to door. To engage in the illicit sale of (narcotics).
Informal. To seek to disseminate; give out: peddling lies.
To travel about selling wares.
To occupy oneself with trifles.
vt. 叫卖；兜售；散播
vi. 沿街叫卖；忙于琐事

例句：
He has been peddling from house to house for weeks.
他挨家挨户作小贩已有数星期。
The man loves to peddle gossip all over the office.
这个人喜欢满办公室散布流言蜚语。

impede
To retard or obstruct the progress of
vt. 阻碍；妨碍；阻止

例句：
Heavy rain impeded our journey.
瓢泼大雨阻碍了我们的旅行。
The attempt to rescue the climbers was impeded by bad weather.
救援登山者的努力因天气恶劣而受阻。

centipede cent-hundred
Any of various wormlike arthropods of the class Chilopoda, having a flattened body composed of segments, each bearing a pair of jointed appendages. The appendages of the foremost body segment are modified into venomous biting organs with which it preys on insects, such as cockroaches.
n.【动】蜈蚣

pedigree gre-crane

词汇起源
[Date: 1400-1500; Language: Anglo-French; Origin: pe de gru 'crane's foot'; because the lines connecting related people can look like the bird's foot]

A line of ancestors; a lineage. A list of ancestors; a family tree.
A chart of an individual's ancestors used in human genetics to analyze Mendelian inheritance of certain traits, especially of familial diseases.
A list of the ancestors of a purebred animal.
n. 血统；家谱；血统,出身

例句：
Party activists with lower middle class pedigrees are numerous.
党内积极分子中中产阶级下层出身的很多。