不中用的

The gharry ponies are gaunt, vicious things that have been sold cheap as having a few years’ work left in them.

矮种马又瘦又不中用，价钱便宜，因为只能干几年活了。

Mr. Kawakami said that while some of Japan's anticrime devices might not seem practical, they were valuable because they might lead to even better ideas.

川上健二说，日本一些防犯罪装置也许中不中用，但仍有启发更好发明价值。