But if we collect it very gently, and we bring it up into the lab and just squeeze it at the base of the stock, it produces this light that propagates from stem to the plume, changing color as it goes, from green to blue.
但是如果我们很小心的收集，并把它带回到实验室中 挤压它的基底部， 它发出了这种 从茎杆往枝干传播的光， 传播的同时还变换色彩， 从绿色到蓝色。