名詞 inbreeding:

1. the act of mating closely related individuals

1. The man, though poor, showed an inbred courtesy.
   那人雖窮，卻表現(xiàn)出天生的謙虛有禮。

in.breed.ing

n.（名詞）
The breeding of related individuals within an isolated or a closed group of organisms or people.
近親繁殖：在一個分離的或封閉的生物群或人群內(nèi)部進行的近親繁殖
The continued breeding of closely related individuals so as to preserve desirable traits in a stock.
同種交配：近親連續(xù)不斷地繁殖，以此來保存某一血統(tǒng)的令人滿意的特性