So what you see here in front of your eyes that kinetic energy can be destroyed, but momentum cannot be destroyed in the absence of external forces.

你眼前所看到的是，动能可被损耗，而动量不会被损耗，若无外力作用于系统。

youdao

There are many, many small holes in here that you cannot see.

这里有很多很有小洞,你们看不见。

youdao

The string is behind here;you cannot see the string.

绳子你们看不到，它在这边。

youdao

"And,when you get the sense of cooperation and common goals, common purposes among the people here today, you cannot help but see that this is something positive growing out of something that is such a tragedy."

VOA: standard.2009.10.19