Half knowledge of anything is dangerous.

对任何东西一知半解都是危险的。

youdao

The half-filled bottle sloshes; the full bottle remains still.; The dabbler in knowledge chatters away; the wise man stays silent.

一瓶子不响， 半瓶子晃荡。

《新英汉大辞典》

The first part of the word, techn actually did mean “art” or “craft” from Greek, while the second half logy means more literally “the writings on” or “the accumulated knowledge about.”

单词的第一部分，techn在希腊语中实际上就意为“艺术”或者“工艺”。 而第二部分logy更加准确的意思是“有关……的著作”或是“关于……累积的知识”。

youdao

After midfielder Hosny Abd Rabou gave the home side the lead midway through the second half, Knowledge Musona struck from distance to bring the visitors level.

CNN: Japan forced to wait for 2014 WC berth

With the knowledge that half the Italian electorate still supports both his domestic and foreign policies, Mr Berlusconi has no intention of bowing out of Italian politics.

BBC: NEWS | Europe | Berlusconi: Out but not down

It has been noted that women are responsible for half of the human knowledge and technical expertise as informal agriculturalists, gardeners, animal-breeders, managers of their community resources as well as technological innovators and agents of change.

UNESCO: OFFICE IN VENICE