glaze v. 装玻璃,上釉voltage n. 电压
注释:
2. anywhere in between with a flip of a switch:就在开或关的一霎那。
练习:
A) Windows can change from clear to dark to save energy.
C) Windows help to save energy by providing heat.
2. When are windows the weak link in a building?
B) In the hot summer.
D) Both A and B.
A) Windows that are coated.
C) Windows the color of which can be changed.
4. To make electrochromic windows change color, what is applied to the window glass?
B) Tungsten oxide.
D) A voltage.
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