飞行器以发泡聚丙烯为主体，在其背部与两个升降舵补助翼（可以操控的界面）上有一个电动机。

The flying robots were built out of expanded polypropylene with a single motor at the rear and two elevons (control surfaces that enable steering).

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美国的失业补助和联邦税收都相对较低，因此，比起其他发达国家，美国财政的“自动稳定器”效果不明显。

With stingier unemployment benefits and a lower federal tax take, America has fewer "automatic stabilisers" than other rich countries do.

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首先，“自动稳定器”(比如失业补助)在衰退期间发挥了作用。

First, "automatic stabilizers" (such as unemployment compensation) came into play during the recession.

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