I ascertained that he was dead.

我确定他死了。

I ascertained that he died three years before.

我查明（或确定）他死于三年前。

Police had ascertained that the dead man knew his killer.

警察已确定死者认识杀手.

Epidemic estimation and parameters fit for China were ascertained.

确定了适于我国流行特点的疫情估计方法和参数；

The researcher ascertained that he had discovered a new element which led to SARS.

研究者确定他已经发现了一种导致非典的元素。

The distribution of alloying elements partitioned between steel matrix and carbides is thus ascertained.

确定了合金元素在钢基体和碳化物之间的分配.

Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.

生物学家已经确定有专门的细胞把化学能转变成机械能.

Based on the design load and internal force employed the content of load test is ascertained.

模型的加载测试内容按照原型桥梁设计荷载及使用内力来确定.

Overvoltage protection level and maximum allowable energy dissipation of MOV are ascertained.

确定了过压保护的重要元件MOV的过电压保护水平和最大允许能耗.

The climatological behavior of the front cannot be reliably ascertained from just two years of monitoring.

仅仅从这两年的的监测来看,锋面的气候变化不能完全可靠地被确定下来.