In the sub - zero weather, their exhausts plumbed white in the grey streets.在严寒天气, 他们的排气管在灰色的街道上吐着缕缕白烟.Typical composition of the auto exhausts is given in Table IV - 6 .汽车尾气的典型成分示于表Ⅳ -6 中.Her book on child - care exhaus...

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