The mixture of Putty and Hardener should be used up before gelling.

It was estimated that these landfills could be used up to 2020.

据估计,这三个堆填区只可应付目前的需要至2020年.

The book would be useful to students in biochemistry courses.

这本书在生物化学课上会对学生有用.

The results may be useful to the transformer design.

这为变幅杆的设计提供了一定依据.

If the wind were contrary, they might be useful to us.

假使碰到逆风的时候, 它们还可以为我们服务哩.

I stumbled across some information that may be useful to us.

我偶然发现了一些对我们可能有用的资料.

This is can be useful to test your array.

这个对你测试阵列很有用处.

Plants provide many chemicals that can be useful to humans, especially for drugs and insecticides.

植物能为人类提供有用的化学物质, 特别是药物和杀虫剂.

It may still be useful to press the point home by working out a particular illustration.

通过一种特殊的说明来表明这点也许仍是有用的.

Before going further, it may be useful to get some perspective on the national debt.

在作进一步讨论前, 先观察一下国内负债情况可能是有用的.

It will be useful to summarize the relevant Gaussian formulae.

有必要概括地讲一下有关的高斯公式.

A test run would be useful to the statisticians.

试运转将对统计学家有用.

The drug will be useful to hundreds of thousands of infected people.

这种药将惠及成千上万的感染者。

Your advice might be useful to others in similar situations.

你的建议可能对处于类似情形的其他人有用.

It can be useful to write a short summary of your argument first.

先把你的论点纲要写下来可能会有帮助。

Once our services cease to be useful to them, we're expendable.

一旦我们的服务对他们不再有用，我们就可能被抛弃。

Goats also be valuable for their hair.

它们的毛发也很有价值.

It may be valuable for flying shears in design and theoretical analysis.

这无论是对于新飞剪机的设计,还是对现有飞剪机的分析计算,都具有实际意义.

Other things we desire and hold to be valuable for themselves alone.

其他我们渴望和认为有价值的东西就是它们本身.

Sharks also may someday be valuable for treatment of human diseases.

鲨鱼也可能在将来的某天能治疗人类的疾病.

Grow a farmer to be versed in both hands keeps giving pedestrian traffic shoeshine.

现象福州,街头闹市.一长排农民工双手不停地给过往行人擦皮鞋.