慢速英语:'Achievement Gap' Closing Slightly for Young Students in U.S.

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1. demonstrate vt.论证;证明，证实
例句：You have to demonstrate that you are reliable
你得证明自己是靠得住的。

2. enforce vt.加强;强迫服从;实施
例句：They struggled to limit the cost by enforcing a low-tech specification
他们通过实施低技术规格拼命限制成本。

3. incredible adj.难以置信的;不可思议的
例句：The wildflowers will be incredible after this rain
这场雨过后，野花会变得美不胜收。

4. opportunity n.机会;适当的时机良机
例句：I had an opportunity to go to New York and study
我曾经有一个去纽约学习的机会。

5. interact vt.互动;相互作用;互相影响
例句：You have to understand how cells interact
你必须明白细胞是怎样相互作用的。