It will let us eliminate the risk we would take of contaminating the samples if they were brought back to Earth.

如果他们被带回地球，会使我们消除可能为样品污染而承担的风险。

youdao

In fact, if you take the longest possible perspective -now looking back about four billion years -you will find that every life form on earth is related to every other.

实际上，如果你从长远的角度来看的话——回顾到四十亿年前，你就会发现地球上的所有生物都是息息相关的。

youdao

In fact, if you take the longest possible perspective - now looking back about four billion years - you will find that every life form on earth is related to every other.

实际上，如果你从长远的角度来看的话——回顾到四十亿年前，你就会发现地球上的所有生物都是息息相关的。

youdao

They needed to change their flight path to take them around the moon and back toward Earth.

VOA: special.2009.07.22

They collected more than thirty kilograms of rock and soil to take back to Earth.

VOA: special.2009.07.15

But there were three astronauts. And the trip back to Earth would take four days.

VOA: special.2009.07.22

OSIRIS-REx will visit an asteroid called 1999 RQ36, take a sample of at least 2.1 ounces and bring it back to Earth.

CNN: So, about that asteroid near Earth ...

This year the Razzies will take a look back at the most dire films of the past decade, with five movies in the running - Battlefield Earth, Freddy Got Fingered, Gigli, I Know Who Killed Me and Swept Away.

BBC: Transformers leads Razzies worst films contest