真是糟糕透顶，古董级的空中交通管制体系错漏百出：2008年，将近25%的美国航班延误。

It's bad enough that an archaic air-traffic-control system has led to pitiful performance: nearly 25% of U.S. flights were late in 2008.

youdao

这项壮举背后的研究员阿里-阿利耶夫称他能利用碳纳米管制出这种斗篷。这种隐形斗篷看上去就像薄线衣。

Ali I Aliev, the researcher behind the feat, said he was able to make the cloak using carbon nanotubes, which look like thin strands of thread.

youdao

这项壮举背后的研究员阿里-阿利耶夫称他能利用碳纳米管制出这种斗篷。这种隐形斗篷看上去就像薄线衣。

Ali Aliev, the researcher behind the feat, said he was able to make the cloak using carbon nanotubes, which look like thin strands of thread.

youdao