现有的白色二极管同样基于蓝色的光——源于这种颜色的光是用于激发一种由钇铝石榴石组成的磷光层。
Existing white LEDs are also based on blue ones, the light from which is used to excite a phosphor layer made of yttrium aluminium garnet (YAG).
这座坐落在亚穆纳河岸边的陵墓主要由白色大理石建成，在日落的黄昏和月光皎洁的夜晚，大理石能够折射出变幻的颜色。
Situated on the banks of River Yamuna, the shrine is largely made of white marble that reflects the changes of colour visible during sunset and clear, moonlit nights.
后来我带着一些科学家去了泰姬陵，让他们看看大理石为什么会消溶，颜色为什么会变黄。
I took scientists with me to the Taj Mahal, to show them how it is getting marble cancer, how it is becoming yellow.
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