Canadian National Tower（加拿大国家电视塔）

加拿大国家电视塔

Next we cross the Atlantic Ocean from the Netherlands to Toronto,Canada, where visitors can stand on an observation deck of the Canadian National, or CN, Tower and see Niagara Falls， about 85 miles away. Over 1,800 feet high, the tower is the tallest freestanding structure in the world.

接下来， 我们从荷兰穿过大西洋来到加拿大的多伦多。在这里，游客们可以站在加拿大国家电视塔(又称CN 塔)的瞟望台上看到85 英里以外的尼亚加拉大瀑布。加拿大国家电视塔高1800 英尺，是世界上最高的独立式建筑。

In the 1960s, Toronto had built many tall buildings. Many were so tall they blocked radio and television signals. The city needed a tower tall enough so that no building could block signals coming from it. Plans were drawn up for the CN Tower.

20 世纪60年代，许多高大的建筑在多伦多拔地而起。其中许多因为过高而挡住了电台和电视台的信号。多伦多需要一座高塔，其高度要超过其他建筑， 这样信号传播就不会再受阻。于是，人们开始构想加拿大国家电视塔。

加拿大国家电视塔

Building something so tall was not easy. Workers used instruments on planes flown over the CN Tower to make sure it was straight. Builders used a helicopter to place the antenna at the tower's top.

要建造这么高的塔绝非易事。工人们需要在飞机上， 在飞过CN塔时使用仪器确保塔的垂直度。建造者利用直升飞机在塔顶放置天线。

Around the tower's base, they constructed a four-Ievel observation deck that waslifted into place high above the ground when it was finished. The top level, Skypod, is the highest public observation deck in the world.

在塔基周围， 他们盖起了四层的瞟望台，在塔竣工之时，他们将瞟望台脱离地面建到高处。最顶层的瞟望台叫做"天空之盖是全世界最高的公共瞟望台。

加拿大国家电视塔

The Tower is a popular tourist attraction. On the bottom observation level, The Glass Floor, visitors walk on a see-through surface and look down at the city below.

这座塔现在已经成为广受欢迎的旅游景点。在瞟望台底层是玻璃地板，游客们可以透过透明的地板俯瞰城市景色。

加拿大国家电视塔