查询词典 four-fold

He can run a four-minute mile, ie run a mile in four minutes or less.

他能参加四分钟一英里赛。

They can work for up to four-month four months during their school break.

他们可以在他们学校放假的时候工作4个月。

To detect the harmonic and reactive power current of four-phase transmission system, the current detection method for four-phase transmission system is presented based on FBD method, which is on the basis of improving the FBD method definitions.

为了检测四相输电系统中的谐波和无功电流，在进一步完善FBD法定义的基础上，提出了一种基于FBD法的四相输电系统电流检测方法。

ABSTRACT: In this paper, a new three phase to four-phase transformer with four phase pillars structure is proposed, its electromagnetism prnciple is analysed, and properties and features of the transformer are also discussed further.

摘 要：首次提出了一种四相四芯柱结构的三相变四相电力变压器，分析了其电磁变换的基本原理，并进一步讨论了这种变压器的性能与特点。

If we plug the current consensus estimate of Q1 GDP growth and then compute the year-on-year four-quarter percentage change, we get a figure of -2.3%. Thus, based on consensus estimates of GDP for Q1 2009, the four-quarter contraction of GDP will be--in the first quarter of this year--already worse than both the baseline scenario figure （-1.9%） and the more adverse scenario figure （-2.1%）.

然而，根据上述环比增长-5%的主流预测值计算，1季度GDP的同比增长率应为-2.3%；这就是说，即使是在1季度，主流预测的GDP同比增长率就已低于压力测试中假设的基准情形（-1.9%）和悲观情形（-2.1%）的数字了。

The four strokes in the four-stroke-cycle engine, in their proper order, are intake, compression, power, and exhaust.

四冲程循环发动机中，四个冲程的固定顺序是：进气、压缩、作功和排气。

Four days later, he ate up Ben Wallace, dropping 20 and 12 on the four-time defensive player of the year.

四天后，他吃掉了四次年度最佳防守队员－本华莱士，得到20分12篮板。

In this scheme, four PLLs are set in the condition of relay for frequency output.The frequency transform time is greatly compressed by the alternate work of four PLLs in comparison with the hop time for frequency transformation of a single PPL.

在本方案中，运用了四个锁相环进行接力式的频率输出，通过四个锁相环的交替工作，使得频率输出改变的时间较之通过单个锁相环改变锁相频率的跳频时间获得了大幅度的压缩。

All four of these frigates are to be delivered within the next four years.

所有四艘这些护卫舰将要在四年内交付。

Indonesia imported four frigates and four fighter aircraft and ordered three more.

印尼进口了4艘护卫舰和4架战斗机，另外还订购了3架战斗机。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。