3. 怎样学会使用这个词？

词：occasional = infrequent, incidental, intermittent, irregular, odd, rare, sporadic, uncommon

英英释义：happening sometimes but not often or regularly

1）翻译下面的句子：

露西擅长山水画，偶尔也画画油画。

Lucy is good at Chinese landscape painting, and does/works on oil paintings occasionally/occasional oil paintings, too.

参考翻译：Lucy is especially good at traditional Chinese landscape painting, but occasionally she does oils too. 

 Though an expert on traditional Chinese landscape painting, Lucy does occasional oil painting too. 

造句：

背景：除了偶尔的逻辑跳跃，他的论文相当具有启发性.

His paper is quite thought provoking except some occasional leaps in logic.