It has a lot of disadvantages: each one of these steps is extremely expensive, it's potentially dangerous and they have the interesting property that the step cannot be performed in anyone's backyard, which is a problem.
多くの欠点もあって これら一つ一つのステップは とてもお金がかかる 危険だという可能性もある これらのステップは 誰かの家の裏庭ではできないっていう 問題もある