But for the most part, official sources like dictionaries only document current usage.

但大部分情况下，官方来源，比如字典，仅记录当前的词语含义。

You can view the current usage of disk blocks: which blocks free, which blocks are occupied by which files.

可以查看当前磁盘块的使用情况：哪些块空闲，哪些块被哪些文件占用。

From these propositions it follows that a dictionary is good only insofar as it is a comprehensive and accurate description of current usage.

根据以上这些观点应该可以得出这样的结论：一部词典只有当它能全面而准确地描述语词的现时用法时才算是好词典，