But budget cuts have hit nasa 's science missions hard .

然而，预算紧缩使nasa的使命难以达成。

I favour more missions but fewer statements .

我赞成多一些使命，少一些宣言。

North korea 's defiance makes these delicate missions both more difficult and more necessary .

朝鲜公然挑衅使得这次棘手的外交使命更加困难也更有必要。

Previous nasa missions to the outer solar system relied on nuclear energy .

美国航空航天局以往的前往太阳系外部空间使命都是依靠核能。

The eu is losing interest even in the peacekeeping missions it once loved .

欧盟甚至正在对它曾经情有独钟的维和使命心感厌烦。