If you ever tried to walk on a fallen tree log, you understand what the expression means.

VOA: special.2009.06.07

"Come on." she says. "You do not need to be a rocket scientist to understand this."

VOA: special.2010.06.27

But before you can resist a threat, you need to understand it.

VOA: special.2009.10.27

First,you have to understand that my brother is one in a million.

VOA: special.2010.09.12

"When I was reared in the British West Indies my grandmother used to always tell me, you may not be loved by certain forces in a society and you have to understand why.

VOA: special.2011.03.20

"Why aren't more science talks in a bar,right? Like this is the place where you learn and you ask and you understand things most quickly, instead of a lecture where it's really just a one-way thing."

VOA: special.2010.05.14

"And I can tell you as a member of the United States Congress, we understand the Constitution,".

VOA: standard.2009.07.07