VOA慢速英语:How to Do It: Making Paper by Hand

都是由什么组成
be made of 是可以看出原材料的,The natives make excellent boats from tree trunks．
土著人能用树干制造很好的小船。
be made from是不可以看出原材料的,例:The paper is made from wood
纸是树木作的(看不出来的)

2. The raw materials are struck over and over until they become loose.

over and over反复, 再三
例句：The barrel rolled over and over.     
桶子不断地滚动着。

3.Then it is left until most of the water dries up.

dry up干涸, 住口
例句：Will his powers of invention ever dry up? 
他的创造力会枯竭吗？

4.The substance left, called pulp, can be stored until you are ready to make paper.

be ready to 准备好
例句：You should be ready to solve any problem that may come along.  
 你应该随时准备解决可能出现的问题。

5.This becomes a sheet of paper.

a sheet of 一张

The engraving was rolling up in a sheet of tissue paper. 
 版画裹在一张薄纸里。 

6.Large machines started to be used for making paper near the end of the sixteenth century

be used for  被用来

Either direct or alternating current may be used for driving electric trains. 
直流电和交流电都可用来驱动电气火车。

7.covered with water and brought to a boil

cover with 用...覆盖

cover with whitewash; as of walls. 
用石灰水刷白；通常指的是粉刷墙。 

8.the pulp is mixed with water again

mix with  与...混合

Oil does not mix with water. 
油不能与水混合。 

9.It is now strong enough to be touched

enough to 足够

Are you rested enough to go on? 
你是否歇够了可以接着干了?