太阳帆的概念提出要追溯到16世纪，德国天文学家Johannes Kepler(开普勒)首先提出利用太阳能驱动物体在星际旅行。
The concept of space sails dates back the 16th century, when German astronomer Johannes Kepler first came up with the idea of using the sun's energy to propel objects through space.
该港口占地面积57平方公里，是世界最大港口之一，并以拥有一座非常醒目高达134米的港口拱桥和一座风格典雅的帆型拱门式歌剧院而闻名于世。
The 57 square kilometre harbour is one of the largest in the world, and famous for the unmistakable 134 meter high arch of the Harbour Bridge and the graceful sail one of the Opera House.
在18和19世纪，小型巡防舰是三桅船，装有方帆，在高层甲板装有约二十门大炮。
In the 18th-19th century corvettes were three-masted ships with square rigging and carried about 20 guns on the top deck.
在18和19世纪，小型巡防舰是三桅船，装有方帆，在高层甲板装有约二十门大炮。
In the 18th-19th century corvettes were three-masted ships with square rigging and carried about 20 guns on the top deck.
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