Space Policy Directive-3 lays out general guidelines for the United States to mitigate the effects of space debris and track and manage traffic in space.

《空间政策指令3》为美国制定了一般性指南，以减轻空间碎片的影响以及跟踪和管理太空交通。

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The United States space agency, NASA, wanted to study the possible effects of space travel on old people.

美国宇航局想要研究太空旅行对老年人的潜在影响。

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Objective To summarize the works of effects of space environments on function of immune system in astronauts.

目的概述近年来有关宇宙飞行影响航天员免疫系统功能的研究进展。

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High levels of domoic acid in the sardines may have worsened the effects of oxygen loss in the water as the fish crowded into a limited space.

VOA: special.2011.03.15

Also on board is a new exercise machine, which is part of ongoing studies into the effects of long-term space flight on muscle and bone loss in astronauts.

VOA: standard.2010.04.05

We will focus our future research aboard this station on the long-term effects of space travel on human biology.

CNN: Bush: 'It is time for America to take the next steps' in space

Increased access to space will bring challenges for medical experts and scientists alike as they attempt to minimise the side-effects of space travel for the general public while promoting the exhilaration of floating in microgravity.

BBC: What are the health risks of space travel?

Most impressively, it has helped construct an orbiting laboratory that offers the prospect of long-term research into the effects of space flight, research that can not just improve the health and safety of our astronauts but also of people on Earth.

CNN: Commentary: Let's aim for Mars