求ldd命令详解

请大家给我讲讲ldd命令。
比如：#ldd /usr/bin/passwd
linux-gate.so.1 => (0x009ee000)
libuser.so.1 => /usr/lib/libuser.so.1 (0x006a1000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0x05589000)
libgobject-2.0.so.0 => /lib/libgobject-2.0.so.0 (0x034ec000)
libgmodule-2.0.so.0 => /lib/libgmodule-2.0.so.0 (0x00bbc000)
libglib-2.0.so.0 => /lib/libglib-2.0.so.0 (0x0070a000)
libpopt.so.0 => /lib/libpopt.so.0 (0x046f5000)
libpam_misc.so.0 => /lib/libpam_misc.so.0 (0x00816000)
libaudit.so.1 => /lib/libaudit.so.1 (0x00bc2000)
libselinux.so.1 => /lib/libselinux.so.1 (0x007f5000)
libc.so.6 => /lib/libc.so.6 (0x0050d000)
libpam.so.0 => /lib/libpam.so.0 (0x00b9c000)
libfreebl3.so => /lib/libfreebl3.so (0x0553d000)
libdl.so.2 => /lib/libdl.so.2 (0x0069a000)
/lib/ld-linux.so.2 (0x004e7000)
这样的结果表示什么？=》前后分别表示什么。谢谢大家了。