For example, are these crops safe to humans and other species that inhabit Earth?

例如，这些作物对人类和居住在地球的其他物种安全吗？

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And worse, Komarov's chances for a safe return to Earth were dwindling fast.

更糟糕的是，科马罗夫安全返回地球的机会正在快速流失。

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The astronauts could use the space station as a safe haven in the event of major problems and rotate back to Earth aboard Russian Soyuz spacecraft, eliminating the need for a shuttle rescue mission.

航天飞机升空后倘若遭遇重大故障，航天员可以将空间站作为安全的避难所并搭乘俄罗斯“联盟”号飞船返回地球，并借以取消航天飞机升空救援任务的必要性。

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Astronauts began their first full day in space by inspecting the heat shield to ensure the shuttle is safe to return to Earth in two weeks.

VOA: standard.2009.07.16

The gravity assist would allow a safe return to Earth even if the spacecraft's main rocket engine failed, Professor Longuski said.

BBC: Manned flight to Mars in 2014?

We can have jobs providing safe, clean, renewable energy that does destroy the earth, the waters, and the air that we breathe.

FORBES: Coal Imports Bolster India's Private Ports

However, the environmental group, Friends of the Earth, believes that even with better containers, OPs still will not be safe.

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