1. solve vt.解决; 解答; 解释
例句：We solve this problem by applying the powerful concept of a model.
为了解决这个问题，我们使用模型这种强有力的概念。

2. experience n.经验，体验; 经历
例句：Nobody wants to remain a beginner. It is merely a rite of passage everyone must experience.
没人希望自己永远是新手，它只不过是每个人必须经历的一段过程。

3. invest vt.投资; 花费
例句：Can I be sure of a profit if I invest?
我要是投资, 肯定能获利吗?

4. competition n.竞争; 比赛; 竞争者
例句：At the calligraphy competition, people asked him to write a few characters.
书法比赛会上, 人们请他留字。
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