它们的

In chapter 4, we define the concept of q-element, and unify group invariant matrix, perfect sequence and q-element. We give their construction, necessary conditions and applications in the theory of difference sets.

在第四章中，我们提出了q-元的概念，并且整合了群不变矩阵、完美序列、q-元这三个概念，给出了它们的构造，它们存在的必要条件，及它们在差集理论中的应用。

Great empires transcend national culture and naturalize the culture they require.

伟大的帝国超越于它们的固有文化，把它们需要的文化纳入到它们自己的范畴中去。

The easiest and most effective way to work with our beliefs is to gently render them inactive or nonfunctional by drawing the energy out of them.

最简单，最有效的和我们的信念一起工作的方法是让它们不再活跃，或去除它们的能量，让它们不起作用。

They use the same senses as we do and their feet and hands are similar to ours, except that chimpanzees still have opposable toes and can grasp things with their feet.

它们使用和我们一样的感官，它们的手脚与我们的很相似。但黑猩猩的脚趾还能对握，它们能够用脚抓住东西。

When a prairie dog senses danger it begins to chirp and retreat to its burrow.

犹他草原土拨鼠拥有很多的天敌，当它们感觉到危险的时候它们会唧唧喳喳的叫然后躲到它们的地洞中。

At a fixed forward voltage, the current is an exponential function of reciprocal temperature,from which the effective barrier height was determined to be 0.784 eV and 0.531eV for the C70/n-GaAs and C70/p-GaAs contacts, respectively.

电学测量表明两种接触均是强整流结，在偏压为±1V时，它们的整流比分别大于106和104，以及在固定正向偏压下，它们的电流都是温度倒数的指数函数，从中确定了它们的有效势垒高度分别为0.784eV和0.531eV。

When they lifted their legs, they encountered the virtual weight of meat. Their muscles flexed and sagged.

当它们抬腿的时候，它们要克服虚拟的肉的重量，它们的肌肉会伸缩或下垂。

Despite of their small size, they were good seagoing and maneuverable ships, only at high speed and shallow waters their maneuverability was decreased.

不必在意它们较小的尺寸，它们都是易于航海和操作简单的好船，只有在速度较高和很浅的水域它们的可操作性才有所减弱。

Our machines have now been running seventy or eighty years, and we must expect that, worn as they are, here a pivot, there a wheel, now a pinion, next a spring, will be giving away; and however we may tinker them up for a while, all will at length surcease motion.

我们的机器已运转了70到80年了，我们一定要准备好，随着它们的磨损，这里的一个轴，那里的一个轮子，今天是一个小齿轮，明天是一个弹簧，它们将停止工作；而且无论我们怎样调整，它们尽管会工作一阵，但终究会停下来。

A weak power can be more reckless than a strong one. Russia needs to learn that in spite of their own enervating foreign wars and economic worries the members of the Western alliance can still unite in front of a challenge.

一个实力较弱的强权不会比一个实力较强的强权具有理性，俄罗斯必须了解尽管现在海外战争消耗着它们的实力，尽管经济困境令它们忧心，但是它们还是可以在共同的挑战面前团结起来。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失