Attention is the taking possession by the mind, in clear and vivid form, of one out of what seem several simultaneously possible objects or trains of thought.
The truth is rarely pure and never simple.
Technology can help us monitor forests, but it's human commitment that will save them.
The greatest tragedy is not death, but forgetting one's mother tongue.
数学是一种思维方式，而不仅仅是一堆事实。
The greatest gift you can give someone is your time and attention.