1 On Earth Day, 175 world leaders met at the United Nations to sign the Paris Agreement, a historic pact to curb the carbon emissions behind climate change. Several speakers kicked off the ceremony by

President's Radio Address THE PRESIDENT: Good morning. Americans are concerned about the high price of gasoline. Everyone who commutes to work, purchases food, ships a product, or takes a family vacat

Hi, everybody. Today, there are 2. 2 million people behind bars in America and millions more on parole or probation. Every year, we spend $80 billion in taxpayer dollars to keep people incarcerated. M

For we know that our patchwork heritage is a strength, not a weakness. 因为我们知道，我们的多元化遗产是一个优势，而非劣势。 We are a nation of Christians and Muslims, Jews and Hindus and non-believers. 我们国家里有基督徒也有穆斯林，有犹太教徒也有印度

But let me show you cutting-edge robotics. 现在我来介绍一下最高端的机器人技术。 Now a lot of robotics is very impressive, but manipulation robotics is really just in the dark ages. 如今许多项机器人技术已经相当厉害，可是在机器人动作控制方面我们遇到了瓶颈，