A little knowledge is a dangerous thing.
一知半解是很危险的事。
A little learning [knowledge] is a dangerous thing.
一知半解是危险的。
Usually a little knowledge is a dangerous thing too. But it is difficult to know all, so find different real specialists and make good relation with them.
通常不全懂也是危险。但都懂很不容易，所以要找不同的真正的专家并与它们建立很好的关系。
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