They report that blood from young mice improved brain operations in older mice.

他们报告出年轻小白鼠的血液能改善老年小白鼠的大脑运作。

They reported that older adults with heavy exposure to air pollution performed poorly on tests of brain operations.

他们指出，大量接触空气污染的老年人在脑部活动测试中表现不佳。

Instead, with the principles of brain operation established, all nature has to worry about is designing new peripherals.

相反，随着大脑工作原理的建立，大自然只需要设计新的外围设备。

Critics of the U.S. healthcare system say they do not think a child who needs a brain operation should have to raise money to fund her own care.

美国医疗保健系统的批评者说，他们认为，不应该让一个需要做脑部手术的孩子为自己的手术费奔波。