This reduces the risk of long and obstructed childbirth.

VOA: special.2010.08.09

I would say, okay, this guy wants me to find a function which reduces to the number a when I take two derivatives, and I know somewhere here, this result, which says that when I take a derivative, I lose a power of t.

出题者想要我找出一个函数,它在经过两次求导后得到数字a,我知道这里的某个地方,这个结论告诉我,我每求一次导,t就降一次幂

耶鲁公开课 - 基础物理课程节选

Professor Walker says this reduces home operating expenses.

VOA: special.2009.10.05

This reduces the risk of infecting the child.

VOA: special.2009.12.02

"They are not looking to hire as many immigrants. So this is the first thing that reduces the level of migration.

VOA: standard.2010.01.20