When the third appeared, he thrust at it with the knife, only to feel the blade[刀片] snap as the fish rolled. 

I say luck is when an opportunity comes along and you're prepared for it.

绿色发展不是选择题，而是必答题，我们要坚定不移地走绿色低碳发展之路。

正是通过观察和思考的力量，人们才能找到方法。所以我们必须不断挖掘和钻研。