经济学人下载:饮用水危机--数百万美国人都在喝含铅水(3)

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It's cheaper to buy in bulk.

大批购买便宜些

2. set aside 留作…之用;留出…用于

130 million pounds would be set aside for repairs to schools.

将划拨1.3亿英镑用于学校的修缮。