The data may point to a real decline in the occurrence of some types of cancer, experts said.

这些数据可以指向一个真正的某种癌症的发生的下降，专家说。

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The occurrence of double sides breast cancer was not related to pathological types and family history.

双侧乳腺癌的发生与病理类型无关，未发现有乳腺癌家族史。

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Through the flotation test, the occurrence form, main carrier mineral and arsenic abundance in both types of coal are analyzed and calculated.

通过浮选试验，对两种类型煤中砷的赋存形态、主要载体矿物及含砷丰度进行了分析和计算。

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For instance, our current strategy of giving medications continuously because of the unpredictable occurrence of events could alter the types of medications being developed.

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