There are doubts about the usefulness of these tests.

Maybe that will combine the usefulness of the two rules, without the drawbacks.

也许这将那两条规则的作用整合到了一起, 没有不好地方.

Typically, when this occurs there is rapid eye movement, which is characteristic of active dreaming.

通常, 当这种情况发生时,人们的眼部运动总是加快, 这是做梦的特征.

This tool even more has usefulness than that.

这个工具比那个更有用.

Medical and environmental causes such as repeated rapid eye movement ( REM ) interruptions from outside noise.

医源 及环境性失眠.如外界噪声多次打断快速眼球运动睡眠相.

With some simple properties, particles can usefully illustrate many laws of physics.

粒子具有简单的性质, 可用来阐明物理学的许多定律.

In these books we are not only most agreeably entertained , but most usefully instructed.

这些书我们不但读起来津津有味, 而且还从中得到许多好处.

We need to find ways of dealing creatively and usefully with our feelings.

我们需要找到一些既有创意又实用的方法来调整我们的情绪。

Make it provide base of vehicle hybrid power system control strategy usefully.

使之有效的为车辆多能源管理系统的控制策略的不断改进提供依据.

Then for about eight hours of each working day you will I hope, be usefully employed.

然后,每个工作日的另外八个小时里,你将从事有用的职业.

Overhead variances may be usefully considered as variable overhead variances and fixed overhead variances.

我们可以把管理费用分为可变费用和固定费用两种.

These offer usefully technologic parameter for widely spreading of technology of magnetic abrasive finishing.

进而为磁性研磨加工的推广应用获得了有实际参考价值的工艺参数.

Occasionally, there were observed specularite particles with their centers usefully converted.

偶尔可见颗粒中心部分未彻底转变完全的镜铁矿.

Within the same life-style, one can behave usefully or uselessly.

在同样的生活方式, 可以有益或无益的行为.

Extra money could be usefully spent on this project.

多余的钱可以有效地用在这个项目上.

A little Japanese can be really useful.

懂一点日语非常有用。

He's a very useful player.

他是个很棒的运动员。

Shoemaking is a useful trade.

做鞋是一种有用的手艺.

He might be useful to us.

我们也许用得上他。

a useful gadget

有用的小器具

Some products can be recycled at the end of their useful life.

有些产品过了有效使用年限后是可以回收再利用的。