书城教材教辅科学读本(英文原版)(套装1-6册)
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第52章 第一册(52)

plants, is full of sap. When it is full grown, the sap is very sweet.""Oh, I see," said Norah. "Then the sugar comes from this sweet juice.""Wait a minute," said Fred, "and you shall see. "When the men know that the canes are ready,they cut them down and saw them into short pieces. Then the pieces are crushed between heavy iron rollers.""That is to squeeze out the juice, of course." said his sister.

"Right." said Fred.

"Now, little sister," he added, "tell me what happens when we boil brine?""Why, the water boils away," said Norah, "and leaves the salt behind.""Right again," said Fred. "You will see how they get the sugar into the sweet juice.

"They boil the juice in large pans. The water in the juice boils away, and the sugar is left behind. As it cools the sugar forms into solid grains.""You must not forget," said Willie, "that this is only raw or moist sugar. It has to be made into white loaf sugar.""They leave this moist sugar to drain, "added Fred, "and what do you think we call the part that drains away from it. It is the treacle we eat on our bread."SUMMARY