对科学家和化学工程师的挑战，是找到与氯氟化碳一样有效井没有其他有害效应的替代物。
The challenge for scientists and chemical engineers is to find substitutes that will be as effective as CFC's and that will not have some other group of harmful effects.
4许多其他的新技术已经推出，使更多的研究，在试管中进行，看看是否会产生有害化学物质的生物效应。
Many other new techniques are now available that enable more research to be done in the test tube to see if chemicals produce harmful biological effects.
4许多其他的新技术已经推出，使更多的研究，在试管中进行，看看是否会产生有害化学物质的生物效应。
Many other new techniques are now available that enable more research to be done in the test tube to see if chemicals produce harmful biological effects.
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