That would be the responsibility of the buyer. We are prepared, however, to provide all the documentation costs.
那是属于买方的责任,我们仅承担提供所有文件的费用。
and assuming such an automatic messenger picked up our first broadcasts of the 1920's,
假定外星人的这种自动化信息装置接收到了我们二十世纪二十年代的第一次广播信号,