Sugar cane（甘蔗）contains around 10% sugar. But that means it contains around 90% non-sugar—the material known as bagasse （甘蔗渣）which remains once the sugar-bearing juice is squeezed out. World production of cane sugar was 185 million tonnes in 2017 , which results in a lot of bagasse.
At the moment, most of it is burned. But Zhu Hongli, a mechanical engineer at Northeastern University, in Boston, thinks it can be put into better use. As she, and her colleagues describe, in Matter this week, with a bit of improving bagasse makes an excellent and biodegradable （可生 物降解的）replacement for the plastic used for disposable food containers such as coffee cups.
Dr. Zhu is not the first person to have this idea. But previous attempts tended not to survive contact with liquids. She knew from previous research that the main reason why past efforts fell to pieces when wet is that bagasse is composed of short fibres which are unable to hold the finished product. She therefore sought' to insert a suitably long-fibred substance.
Bamboo seemed to be the best choice. It grows quickly /degrades readily and has appropriately long fibres. And it worked. When the researchers blended bamboo remaining into bagasse, they found that the result had a strong crossing of short and long fibres.
To put their new material through its paces, Dr. Zhu and her colleagues first poured hot oil onto it and found that, rather than passing through the material, as it would have with previous, bagasse products, the oil was resisted by their invention.
They also found that when they made a cup out of the stuff and filled it with water heated almost to boiling point, the cup remained unbroken for more than two hours. Though this is not as long as a plastic cup would Hast, it-is long enough for all practical purposes.
【小题1】What do we know about bagasse?| A．It is widely used. | B．It is usually wasted. |
| C．It can not be degraded. | D．It takes up 10% of sugar cane. |
| A．The cups are not disposable. | B．The fibres of bagasse are short. |
| C．The plastic can not be replaced. | D．The material is not biodegradable. |
| A．It can let oil pass through. | B．It can be boiled in the water. |
| C．It can hold liquid and resist heat. | D．It can reduce the use of bamboo. |
| A．New Bamboo Containers | B．A New Application of Fibres |
| C．Young and Promising Materials | D．A Perfect Mix of Cane and Bamboo |
