这次食物中毒的爆发被追溯到一些受污染的贝类。

The outbreak of food poisoning was ___traced to some contaminated shellfish.

他们将自己的家族追溯到早期的定居者。

They ___trace their family back to the early settlers.

这个新展览让我们能够追溯这位艺术家40年来的发展。

This new exhibit allows us to ___trace the artist's development over 40 years.