Reference http://www.360doc.com/content/14/1219/01/17132703_434028032.shtml
I can use the following in My computer:
1. Trimming the screenshot
Press and hold command+shift+4 will make your mouse cursor become the crosshairs, use it to select the screen image area you want, click the space bar can be easily intercepted. Files can be found on the desktop.
2. Instantly hide the dock (app icon bar at the bottom)
If you think the dock is in the way, hold the command+option+d and hide it. When you want to restore it, press it again.
3. Quickly view and manage running applications
Press and hold command and then click tab, Q Close, h minimize.
4. Turn the spotlight search function into a calculator and translator.
Just hold command and press SPACEBAR, and Apple's Spotlight search will appear, allowing you to easily find the files or music you want. But the real secret of this feature is that it also has basic computational capabilities. So when you need to do something slightly more complicated, just type the formula in the search bar to get the answer. OS X Yosemite Users can also search by spotlight to get a well-organized search result in Wikipedia. You can also open the desired application through the search bar.
(Note: If you install Wubi after, according to the online tutorial, put command+ SPACEBAR, change to, switch input method. Control and-Key, is spotlight.^-)
5. Easily group files into one folder
If you think your desktop is too cluttered, there's a knack for making it easy to integrate files into a single folder. Just select all or click the file you want to group, then right-click on "Create a new folder for selected files".
6. Open your Mac's own dictionary for translation
Stop the mouse on a word and press command+control+d.
Command+0, 1, 2, 3, 4, switch to a different dictionary.
Some quick features in the MacBook