It has been difficult to ascertain the correct source of origin.

It is difficult to ascertain the exact duration of protection.

要弄清确切的予防有效期并不容易.

They are doing everything possible to ascertain his whereabouts.

他们正在尽力调查他的下落.

The insurance adjustor had to ascertain the exact value of the missing jewels.

这个保险金估算人必须核实这些丢失的珠宝的价值.

It's difficult to ascertain the coal deposits.

煤储量很难探明.

I'm going to ascertain the truth.

我要查明真相.

Through doing this, the teacher will be able to ascertain the extent to which the child understands what he is reading.

这样一来，老师就能确定孩子们对他所读的内容理解多少了。

A Swiss company offers to help environmental investors by sending teams round factories to ascertain their greenness.

一家瑞士公司表示愿意向工厂周边派遣小组进行环境检测以协助环境投资者。

Take time to ascertain what services your bank is providing, and at what cost.

花些时间确认一下你的银行会提供什么样的服务，费用是多少。

It can be difficult to ascertain the facts.

可能难以查明事实真相。

Scattered matter, brought to an ascertainable density, closed, with the weight of the world.

分散的事物达到一定可确定的密度与世界之重相交.

Office of Finance says they accept as collateral only securities that have an ascertainable market value.

FHLB财务部表示,他们只接受具有可确定市场价值的抵押品.

Is the exact value of the missing jewels ascertainable?

那些不知去向之珠宝的确切价值弄得清楚 吗 ?

These accidents have been ascertained through investigation to be major liability accidents.

通过调查认定,都是重特大责任事故.

She could not take her ease till she had ascertained some particulars.

她得把有些具体事弄确切了,才能放下心来.

The previously unidentified object has now been definitely ascertained as satellites.

先前的不明飞行物现在已经查明了是卫星.

The optimum technological parameters were ascertained by orthogonal experiment.

用正交试验方法优化确定了工艺参数.

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.

How could it ever be ascertained that his mind was truly cleansed?

怎么能断定他已经洗心革面了 呢 ?

As a matter of fact, you needn't bother to ascertain. I ascertained. They're real.

说实在的, 你们不必细看,我检查过了,统统都是真的.

The rim of the plugs is usually not exposed and the enveloping material cannot be ascertained.

岩栓的边缘通常是不露出的,因而不能确定其包裹的物质是什么.