Google has been said of the optimization of keywords, and everybody is easier to say so, but due to update too fast. No one can in Google ranking a week not come off. But drop down nor the difference is too big, better than the total with baidu. But Google ranking will have some illusion. I have a habit, is to look inside from flowmeter tools keywords. Some people point Google in the link, the keywords in direct point back. I Really happy one. Some of my keywords all rows in the first or second place. For example, chemical pump, magnetic pump, self-suction pump, submerged pumps, mudline booster pump, sewage pump these wholly up to second place. Happy. But I don't trust, from site into valley http://www.hwubook.com