Natural gas is a bridge to a cleaner energy future, but we must cross that bridge responsibly.
不敢冒犯别人的人不可能诚实。
Every tree planted today is a legacy for generations we will never meet.
制造链式反应机器的基本点当然是确保每次裂变产生一定数量的中子,其中一些中子再次有效地产生裂变。