There was once a church choir that was not ill-bred, but I have forgotten where it was, now.

从前有一个教堂唱诗班，它倒不像这样没有教养，可是我现在已经忘了它在什么地方了。

youdao

if most individuals are bred from a small number of parents, they could be vulnerable to a genetic disease, potentially wiping out almost the whole population at once.

(举例来说，假如大部分个体是由小部分的父母亲繁衍而来，他们更易受到遗传疾病的侵袭，甚至有可能让整个种群几乎在一次侵袭中全军覆没。)

youdao

Once upon a time in the immense Russian steppe, lay a little village where nearly all the inhabitants bred horses.

很久以前，在广阔的俄罗斯大草原上，有一个小村庄，在那里所有的村民都养马。

youdao

Hatcheries were tried once, with the result that a lot of ill-bred fish got into the gene pool.

ECONOMIST: Cities and the environment