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2真题出现次数
2套试卷
0次落在考点上
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真题原句共 2 句
n. 一部分，一份2 次
Campgrounds are a tiny portion of the overall infrastructure backlog, and businesses in the parks hand over, on average, only about 5% of their revenues to the National Park Service.
露营地在全部基础设施积压项目中只占极小一部分，而且公园内的商家平均只把约5%的收入上缴给国家公园管理局。
Conversely, if homework matters, it should account for a significant portion of the grade.
反之，如果家庭作业重要，它就应当在成绩中占相当大的比重。