The essential characteristics of the electromechanical keyboard have changed dramatically over the past 20 years, says David Hill, vice President of design at Lenovo.
联想公司的设计副总裁大卫·希尔表示，机电键盘的本质特性在过去20年大大改变了。
2
President Obama said lessons of the past had been learned.
奥巴马说，我们吸取了过去的一些教训。
3
Over the past three years, many Israelis have told me that President George W. Bush was too good a friend of theirs.