There is a way to get rid of the red color: 13. When a bright light is shone on the mechanophore, the broken bond is fixed - and the red color disappears. This self-healing may be a problem for engineers. They need to use the color-changer in big construction projects that will be 14 , in sunlight. And sunlight will make the mechanophores warning system useless.
Sottos and her fellow scientists still have15 work to do before the color-changing molecules can be used outside the lab.
练习:
1. A measures
B accidents
C actions
D collapses
2. A they
B it
C some
D most
3. A with
B over
C at
D in
4. A before
B after
C once
D while
5. A together
B behind
C down
D apart
6. A contacting
B conducting
C containing
D considering
7. A controlled
B spotted
C repaired
D changed
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