It is a layer of guanine crystals which glow at night.这是的氨基羟尿环水晶层数发光在晚上.These crystals are then embedded in a plastic, and the plastic is extruded as a wire...然后将这些晶体嵌入一块塑料，再把塑料挤压成线。We tried to grow some copper sulphate ...
We tried to grow some copper sulphate crystals with our children.我们想跟孩子们一起制作硫酸铜晶体。The flakes seem to fuse together and produce ice crystals.雪花好像融合在一起形成了冰晶。These thin crystals transmit much of the power.这些薄薄的晶体传导了大部分的动力。...