A luxury is excessively expensive in general.
奢侈品通常是不便宜的。
This is not expensive in general, but expensive, no reason.
这不是一般的贵,而且贵得没理由。
In general, the emissions cuts picked by politicians are far more expensive than those chosen by the private sector.
总的说来,政客们选择的减排项目比私有行业选择的项目更花费钱财。
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