A U. S. Navy nuclear-powered attack submarine, under heavy escort, has arrived back at its home port of Guam after a fatal accident at sea.是什么意思_A U. S. Navy nuclear-powered attack submarine, under heavy escort, has arrived back at its home port of Guam after a fatal accident at sea.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句