Dr Dayan says it could take two to three lifetimes for them to disappear from the population.

达扬教授称，可能需要两到三代人才能令阻燃剂在人群中消失。

youdao

Just two or three lifetimes ago, most people in what are now called industrialized countries lived by farming.

在现在称之为工业化国家，仅仅在两三代人之前，大家都是生活中农业社会。

youdao

Rosenberg has had exclusive buying arrangements with all three painters during much of their creative lifetimes, and every painting in his collection was bought directly from the artist.

FORBES: Just How Rich Are Dominique Strauss-Kahn And His Wife Anne Sinclair?

These last three years have been as difficult for the world economy as anything that we've seen in our lifetimes.

WHITEHOUSE: President Obama Delivers Remarks at CEO Summit Of The Americas | The White House