兴奋的

To suppress the spread of the ragweed, there have been a lot of studies on their chemical control, physical control, plant displacement and biological control.

为抑制其种群蔓延，前人开展了化学防治、物理防治、植物替代和生物防治等对豚草的防控研究。

But sometimes a good joke can sneak up on the brain from an unexpected quarter.

但有时候某个很好的笑话可能会不经意地接近大脑的某个角落，然后在某个意料不到的时刻冒出来让你发笑。