And if we do, in fact, hit it with light to get the electrons off, it will go back to the straight up in position, or if it gets knocked hard enough it does that, too.

而且如果我们这么做，事实上，用光轰击它以逐出电子，它就会在原位置沿直线返回，或者如果它被撞击的足够猛烈,也会出现上述现象。

麻省理工公开课 - 化学原理课程节选

But, you know what, over the last three and a half years, I have taken strength from you, the American people. (Applause.) Because I've seen your resilience, I've seen folks get knocked down and get right back up.

WHITEHOUSE: The White House

And his father used to tell him, Champ, when you get knocked down, you get up.

WHITEHOUSE: President Obama on the American Jobs Act in Scranton, Pennsylvania | The White House

You folks are tougher than any tough time. (Applause.) When we get knocked down we stand back up. (Applause.) Some workers lost their jobs -- they went back to community college, got retrained and now have got a new job.

WHITEHOUSE: The White House