英语听力精选进阶版 13686（在线收听）

Do women have unlimited human eggs?

 Vocabulary

long-held theory

set of ideas that have been accepted for a long time

shattered

destroyed or changed

stem cells

tiny biological structures which can multiply and be used to create specialised tissue for human organs

to fish them out

to remove from

spontaneously

naturally without force

ethical

moral

fertilised

(eggs) joined with sperm in order to start the process of reproduction

findings

information discovered as a result of research

unprecedented

never before happened

to overcome

to solve a problem that has prevented you from achieving something