Article in English: Apple makes it easy to check your Random Access Memory, or RAM. RAM indicates the memory your computer has for quick tasks, and more RAM leads to a faster computer. " This will bring up your computer's specifications, including memory used and RAM. If your RAM is not easily visible, click "More Information" to find it. The number will be in GB, and is usually between 4-16GB.

Summary in Chinese:
点击左上角的“Apple”图标。 点击“关于本机”。