Over the years, li Chengju has always been insisting on diligent study and strenuous training and accordingly obtained exquisite artistic skills and broad artistic accomplishments.

多年来，李成举坚持勤学苦练，因而获得了精湛的艺术技巧和广博的艺术修养。

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But the authors of this study say there is growing evidence that more people are insisting on smoke-free homes.

BBC: Childhood asthma 'admissions down' after smoking ban