1. grave adj.严重的; 重大的
例句：I made a grave mistake.
我犯了一个严重的错误。

2. describe vt. 叙述; 描写，形容
例句：We study samples in order to be able to describe populations.
为了了解总体，必须研究样本。

3. distribute vt.分配，散布; 散发
例句：The state had to distribute rewards to those who deserved them.
国家应对那些做出贡献的人给予奖赏。

4. impressive adj.可观的; 给人印象深刻的
例句：A cathedral is an impressive building.
大教堂是能给人留下深刻印象的建筑物。
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