Landing on Mars is a notoriously tricky business. There has been about a 50% failure rate on all Mars missions since Russia launched the first one in 1960.是什么意思_Landing on Mars is a notoriously tricky business. There has been about a 50% failure rate on all Mars missions since Russia launched the first one in 1960.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句