用户tom的主目录有执行权限，但是没有读权限，所以用户ian不能列出内容，但是如果知道对象存在，就可以访问目录下的对象。
User tom's home has execute but not read permission, so user ian cannot list the contents, but can access objects within the directory if he knows they exist.
用户tom的主目录有执行权限，但是没有读权限，所以用户ian不能列出内容，但是如果知道对象存在，就可以访问目录下的对象。
User tom's home has execute but not read permission, so user ian cannot list the contents, but can access objects within the directory if he knows they exist.
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