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1.concentrate vt.& vi.专心于；注意
We must concentrate our energies on treating addiction first.
我们必须首先集中精力治疗毒瘾。
2.relocate vt.& vi.迁移；重新安置
If the company was to relocate, most employees would move.
如果这个公司要搬迁，多数员工也要搬家。
3.outdoors n.户外；露天；野外
Life in the great outdoors isn't supposed to be luxurious.
美好的户外活动不必很奢侈。
4.urban adj.都市的
The government is spending billions of dollars on new urban rail projects.
政府正把数十亿元花在新城市铁路项目上。
