Sent_en: 2ms 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: Menurut Berita Nasional Geographic, "NASA, Agensi Angkasa Eropah, Jepun, dan Rusia semua telah membina layar-layar solar, tetapi tiada satu pun yang pernah cuba untuk membuktikan bahawa layar itu boleh menggerakkan kapal angkasa di bawah penerbangan terkawal."