Small amounts of the gas will cause a person's head to hurt.

VOA: special.2010.02.02

All change begins in the mind of single person or a small group."

所有改变从一个人或一小众人的思想开始“

哈佛公开课 - 幸福课课程节选

But in a small,short person, Skinner says,just 3 kilograms can make the difference between a healthy weight and obesity.

VOA: standard.2010.03.09