2024年3月10日发(作者：惠普电脑怎么样)

four generations课文赏析

课文；

The first vacuum tubes computers are referred to as, first

generation computers, and the approximate period of their use

was from 1950 to 1959. UNI VAC (UNIVersal Automatic Computer)

is an example of these computers which could perform thousands

of calculations per second. Those devices were not only bulky,

they were also unreliable. The thousands of vacuum tubes

emitted large amounts of heat and burned out frequently.

The transistor, a smaller and more reliable successor to

the vacuum lube, was invented in 1948. So-called second

generation computers, which used large numbers of transistors

were able to reduce computational time from milliseconds to

microseconds or millionths of seconds. Second-generation

computers were smaller, faster and more reliable than first-

generation computers.

Advances in electronics technology continued, and

microelectronics made it possible to reduce the size of

transistors and integrate large numbers of circuit elements

into very small chips of silicon. The computers that were

designed to use integrated circuit technology were called third

generation computers, and the approximate time span of these

machines was from 1960 to 1979. They could perform many data

processing operations in nanoseconds, which are billionths of

seconds.

Fourth generation computers have now arrived, and the

integrated circuits that are being developed have been greatly

reduced in size. This is due to microminiaturization, which

means that the circuits are much smaller than before; as many

as 100 tiny circuits are placed now on a single chip. A chip

is a square or rectangular piece of silicon, usually from 1/10

to 1/4 inch, upon which several layers of an integrated circuit

are etched or imprinted, after which the circuit is

encapsulated in plastic or metal.

解读：

Though the costume consisted only of a sheet, it was very

effective.

尽管化装服仅由一个被单制成，却十分逼真。

She wanted to find out whether it would be comfortable to

wear.

她想看穿起来是否舒服

（1）only的用法

only不仅可以作形容词，表示“唯一的，仅有的”，还可以作副

词，表示“仅仅，只”。

①形容词时，表示唯一时，也可理解为最好的，最适当的。比如：

He is the only person for the job. 他是这个工作最合适的

人选。

还有一个短语可以记一下就是：the only thing is … 问题是，

只是，不过。

I’d love to come - the only thing is I might be late. 我

很想去，只不过我可能会迟到。

在实际应用中，only作形容词的形式不太多见，大多都使用了

其副词的含义。

②only作副词时，在句子中的位置比较灵活，可以在句前，句

尾，句中。

The bar is for members only. 这间酒吧只对会员开放。

在修饰主语时，则往往放在主语的前面。

Only five people turned up. 只来了五个人。

Don’t blame me, I’m only the messenger! 别责怪我，我只

是个传话的。

前两天大学英语四六级又上了热搜，其中翻译有一个四世同堂，

这里四世就是四代人，所以翻译为Four generations即可，如果要

把同堂也翻译出来，可以写为Four generations under one roof.

同样，在表示家庭成员时，only child则表示“独生子女”，大

家也可以了解一下。

（2）whether表示“是否”时，与if的区别

if作“是否”解时，多用于口语，引出宾语从句，不能直接跟

or not连用。

I doubt if it will rain today. 我不能确定今天是否会下雨。

whether则多用于书面语中，可与or或or not连用，除引出宾

语从句外，还可引出主语从句、表语从句、同位语从句或与不定式连

用。

I don't care whether he stays or goes. 我不在乎他是留下

来还是离去。

It is doubtful whether it is true or not. 这件事的真假是

可疑的。