All happy families are alike; each unhappy family is unhappy in its own way.
No matter what happens in life, be good to people. Being good to people is a wonderful legacy to leave behind.
The trick is to pay attention to what's happening around you and to keep writing.
在能源问题上，我们必须超越自己的生命周期去思考。
在距离与重量成反比的情况下，物体处于平衡状态。