laughing off

nowadays nobody is laughing off the idea of martian life , and that change in perception could affect the design of future mars probes.

现在，没有人会对火星生命仅仅付之一笑了，这种认识的转变将会影响下一代火星探测器的设计。

Had I been too hasty in laughing off warnings that my Facebook and Twitter activism back in the UK would land me in trouble?

有人警告过我，我在英国时在Facebook和Twitter上的积极活动将给我带来麻烦，而我却一笑置之。我是不是太轻率了？

At that time, I have forgotten what is not said, but it is certainly echo the black joke everyone said, laughing off or expressed support.

我已忘记了当时有没有说过甚麽话，但肯定是附和了大伙说的黑色笑话，笑过或表示过认同。