摘要:aural radio range 无线电导航有声信标 aural reception 收听 aural transmitter 伴音发射机 aurora 极光 aurora australis 南极光 aurora borealis 北极光 autage 故障 authentication 确认 autoacceleration 自动加[阅读全文]

摘要:Two men were travelling in a very wild and lonely part of America． For days they had not even seen a house， only a few huts made of wood， or tents made of skins．[阅读全文]