translation.en: Now, this sounds more heroic than it actually is, because the technology to use radio isotope thermal generators wasn't available in Europe at that time, so there was no choice.
translation.zh: 这听起来比事实更称得上是壮举， 因为那时放射性同位素热电机的技术 在欧洲尚未得到应用，所以当时别无选择。