2024年2月29日發(作者:工業經濟運行分析)

Plastics
No other material in the history of the world
has been ud for so many different purpos.
But what special qualities do plastics have?
Why do countless people posss so many
things made of plastics? They buy plastic
articles becau they are not only cheaper but
also often much better than articles made of
other materials, becau their smooth surfaces
are so easy to keep clean, becau they will not
catch fire, and becau they are not damaged
by water.
It is quite extraordinary how many different
kinds and qualities of plastics there are. They
can be harder than wood or softer than rubber.
They can be made so strong that they will last
almost for ever. They can be made as clean as
glass or completely black. They can be made
any color you like to choo. They can even be
made to look like wood or rubber.
The manufacture of plastics requires a large
quantity of heavy machines as well as a
knowledge of science. Today the greater part
of plastics is manufactured by the world's great
oil refineries and chemical works. Chemical
works are factories which produce
chemicals ― a man-made liquids, gas and
solid materials. The refineries and chemical
works produce many different kinds of raw
plastics, which are then taken to the tens of
thousands of factories which made plastic
products.
Machines for making plastic objects are very
different from tho ud for manufacturing
articles of wood or metal or other natural
materials. For raw plastics must first be
softened by heat and then presd into moulds.
It is the moulds which give plastic objects their
shapes. The moulds can be of any shape or
size. And the same mould can be ud over and
over again. In fact one mould can produce
世界上沒有哪種材料能有這么多用途。但是塑料有什么功能呢?為什么有數不清的人使用由塑料制作的東西?他們買塑料制品不僅是因為便宜,而是因為它比其他材料制造的東西好的多。塑料的表面很光滑,很容易保持干凈;也由于塑料不易著火,也不會被水損壞。
有如此多的不同種類不同品質的塑料,這是多么神奇的事情啊。它可以比木頭更硬,也可以比橡膠更軟。它可以制造的如此牢固以致于永遠都不會被損壞。它可以像玻璃一樣干凈或者就是全黑。它可以被制造成任何你想要的顏色。它甚至可以被制造成木頭或橡膠一樣。
制造塑料需要大量重型機械和科學技術。當今絕大部分的塑料都是由煉油廠和化工廠制造的?;S是制造像人造液體,氣體和固體材料等的化學制品。煉油廠和化工廠制造的不同種類的塑料原料被送往成千上萬制造塑料品的工廠。
制造塑料品的機器與那些制造木頭、金屬或其他天然材料的機器不一樣。塑料原料必須要通過高溫軟化,然后用模具加壓。模具是用來給塑料物品成形的。這些模具可以成為任何形狀或尺寸。而且相同的模具可以被重復使用。事實上一種模具在淘汰之前,可以生產成千上萬的物品。這就是為什么塑料制品
many thousands of articles before it wears out. 如此便宜的原因了。
This is one of the reasons why plastic things
are so cheap.
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