大多数鸟类都有保护他们幼仔接近食肉动物的天性，但是他们最终会因为来袭者的强大或者危险去阻止而放弃。
Many birds have an instinct to protect their young when approached by a predator, but they will eventually give up if the predator is too strong or dangerous to deter.
虽然地震来袭之前很少或者没有什么征兆，但是研究人员们还是在寻找一些危险信号。
Though earthquakes seem to strike with little or no warning, researchers have been searching for danger signs.
恐惧被定义为一种对确切的或者已察觉的突然来袭的危险的情感上的反应。
Fear is defined as the emotional response to an actual or perceived threat of immediate or imminent danger or pain.
应用推荐