根据一项新理论，行星，甚至高级生命，理论上可能会存在于黑洞之内。
Planets and maybe even advanced life could theoretically exist inside a black hole, according to a new theory.
这是一种很聪明的技术，也是一项合理且有理论根据的策略。
It's a very clever technique and is a strategy that is evidence-based and rational.
一些环保团体认为，即使是一项本质上无害的试验，也有可能标志着滑向危险的第一步，根据滑坡理论，有了这第一步，就完全有可能最终导致全面大规模地应用这些技术。
Some environmental groups feel that even physically harmless tests could represent the first step onto a slippery slope that would ultimately lead to full scale deployment of these technologies.
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