Sent_en: 2zh According to the National Geographic News, "NASA, the European Space Agency, Japan, and Russia all have developed solar sails, but none has yet tried to prove that the sails can propel a spacecraft under controlled flight."
Sent_yy: 据《国家地理新闻》报道，“美国国家航空航天局、欧洲航天局、日本和俄罗斯都已经研制出了太阳帆，但还没有一个国家试图证明太阳帆可以推动受控飞行的航天器。”