2,breakthrough

　　n.重大发现，突破：make a breakthrough at some single point突破一点

　　3. brake v.刹车； n. 闸 rake

　　4,breath ea[e]

　　n.气息，呼吸：I blew my breath against the mirror. Blur vague

　　catch one's breath喘息，气喘；屏息，歇口气

　　hold one's breath屏息

　　out of breath喘不过气来，上气不接下气

　　take one's breath away使惊羡不已

　　under one's breath压着嗓子，低声地

　　5.breathe ea[i:] 呼吸 bath [a:] bathe[ei]

　　6,breed［bri:d］

　　vt. /vi.(bred，bred)①(动物)生仔，(使)繁殖，生殖：Rabbits breed quickly.

　　②饲养：The housewife has been breeding chickens for years.

　　③产生，引起：Dirt breeds disease.

　　④养育，教养：well bred教养良好的

　　n.(牲畜等的)种类，品种：What's your favourite breed of dog?

　　kind/sort指一般的种类； type类型 , breed 动植物的种类 a dog of mixed breed