符号链接是一个指针，指向文件在文件系统中的位置。

A symbolic link is a pointer to a file's location in the file system.

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说明：尝试使用调用的一个指针参数时-系统检测到无效指针地址。

Description: The system detected an invalid pointer address when it tried to use a pointer argument of a call.

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这和需要你猜测某个内存片包含对象指针和一些类似对象指针的随即数据的老式GC系统有鲜明的对比。

This is in contrast with conservative GC systems which requires you to guess whether some piece of memory contains an object pointer or just some random data that resembles an object pointer.

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They can be 64 bits, but very often on systems today are pointers 32 bits.

也可能为64位，但在通常的,系统中，指针占32位。

哈佛公开课 - 计算机科学课程节选

Now that's changing the more years that pass the more of you have 64-bit computers and the more servers have many, many gigabytes of RAM and so you need actually 64-bits, but for now let's assume a common system whereby a pointer just by definition of the homework is 32 bits.

现在计算机也在改变，也有更多的人,使用64位的计算机，更多的服务器有很多，很多G的内存，那样你就需要64位的，现在我们假设通常的系统中,根据家庭作业所定义的，一个指针为32位。

哈佛公开课 - 计算机科学课程节选