1. there are stocks that get beaten up, give a pause at or near the bottom and then begin to head back higher. These stocks generally have something in common; it‘s a combination of upgrades and higher earnings estimate revisions.
2. the stock market is somewhat like a helium balloon. Its natural tendency is to go up as long as something isn‘t pushing it down
原文：http://www.cnblogs.com/qiangxia/p/4784910.html