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hit and miss 英 [hit ænd mis] 　美 [hɪt ənd mɪs]

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hit and miss

phrase. 碰巧的；偶然随意　

Windows 7 tries to handle touch operation but it is still hit and miss.　Windows7虽然尝试了手触操作，但仍然不得要领。

"It was totally hit and miss, " says Rosemary Osborne of Procter and Gamble in Cincinnati, Ohio.　“完全就是一点一点试出来的。” 来自俄亥俄州辛辛那提宝洁公司的罗斯玛丽.奥斯本说。

1. Windows 7 tries to handle touch operation but it is still hit and miss.

Windows7虽然尝试了手触操作，但仍然不得要领。
2. "It was totally hit and miss, " says Rosemary Osborne of Procter and Gamble in Cincinnati, Ohio.

“完全就是一点一点试出来的。” 来自俄亥俄州辛辛那提宝洁公司的罗斯玛丽.奥斯本说。
3. This fact makes a query like $fr['translations']['TREE']; somewhat hit and miss, unless the code making the query is sure of the provenance of the array.

这个事实使得类似 $fr['translations']['TREE']; 的查询有些碰运气，除非进行查询的代码确定数组的起源。