Flecks so light they looked almost a caramel gold .
斑点看上去很轻，他们几乎是焦糖金牌。
But a new study reports that these tiny flecks of carbon can shrink tumors in mice by delivering chemotherapy drugs to cancer cells .
不过，最近的一项研究显示，这些细小的碳颗粒能将化疗药物送进大鼠的癌细胞里而致其萎缩。
Some of these fine particles -- suspended in air as primary organic aerosols -- are tiny flecks rich in carbon , often from sources such as diesel exhaust .
