perforation occurs.

It is known that electronic computers play an important part in science and technology.

大家必须记住，在呕血、黑便，或穿孔发生之前，该病可能无症状。

过去人们常常认为一个词从看见到念出来包括好几个处理阶段。

我们知道，电子计算机在科学和技术方面起着重要作用。

第6节 翻译练习7

It follows that any form of preheat adds to the welder’s difficulties and causes discomfort, particularly when welding at high preheat temperature levels inside vessels.

It can be concluded that temperatures on the surface of Venus is too hot for life as known on earth. It had been calculated that actual error probability for the value was of the order of 0.5 percent. 由此可见，任何形式的预热都会增加焊工的困难，使他们身感不适，在容器内高温预热下施焊时尤其如此。

可以断定，金星表面的温度过热，地球上的生物是不能适应的。

据计算，这个数值的实际误差概率约为0.5%。

第6节 翻译练习8

It makes no difference when inducing an e.m.f., which moves, the coil or the magnet.

It is essential that the body of the machine is effectively earthed.

在感应出电动势时，是线圈运动还是磁铁运动，这没有区别。

这机器的机身必须有效接地，这一点十分重要。

第6节 翻译练习9

The heating effect makes it possible to produce the light.

We find it possible to transform a.c. into d.c. by using a rectifier.

We think it true that the human body is also a good conductor.

热效应使产生光成为可能。

我们发现能用整流器将交流电变成直流电。

人体也是一种良好的导体，我们认为这点是正确的。

第6节 翻译练习10

It is the voltmeter which we use to measure the voltage.

It is through this interface that the substation operator must control and monitor the entire substation.

It was not until I came in that he began to repair the old generator.

我们用来测量电压的就是伏特计。

变电站运行人员正是通过这个界面控制和监视整个变电站的。

直到我进来，他才开始修理那台老式发电机。

It was not until the 19th century that heat was considered as a form of energy.

直到19世纪，热才被认为是能的一种形式。

第4章 总复习题

The rise in temperature could not have happened of itself.

Be the shape of a body complicated, it is possible to find out its volume.

The more energy we desire to send, the higher we make the voltage.

The most typical humanlike characteristic of a robot is its arm.

温度上升不可能是出于自身的原因。

不论物体的形状如何复杂，人们均可求出它的体积。

要求输送的电能越多，就得使电压升得越高。