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1·For example there is a great deal of sea transportation tall ship in Greece and Norway etc. nation, providing a conveyance service, this is a kind of invisible trade.

譬如希腊和挪威等国家有大量的海运船队，提供运输服务，这就是一种无形交易。

2·In addition to visible trades such as import and export goods and merchandise etc. outside, there is also invisible trade, include the commutation for serving of the of nation among them.

除了进出口货物和商品等有形交易之外，还有无形交易，其中包含国家之间服务的交换。

3·Another brought down the World Trade Center, closing its Windows on the World restaurant forever and putting up new invisible and concrete walls among people at a time shen we thought 11.

而另一个则把世贸大厦炸掉了，关闭了世界这座大饭店所有的窗户，让我们每当想起11就会感受到它所建起的新的，看不见却牢不可摧的壁垒。

4·There are serious pollution problems in the scrap trade, among which the biggest risk is invisible pollution such as heavy metals and chemicals in wastes.

废品回收存在很大的污染问题，而最大的风险是看不见的污染，如废品中的重金属和化学品。