当植物的叶子或根茎被切开时，植物就发出痛苦的信号(或者也许仅仅是不高兴)：在整个表面释放出气体乙烯。
When a leaf or a stem is sliced, the plant signals pain (or perhaps merely dismay) by releasing the gas ethylene over its entire surface.
在荧光素酶中加入正确的荧光素底物就可以放出荧光，而发出的光子可以被光敏感元件，如荧光探测器或改进后的光学显微镜探测到。
Light is emitted when luciferase is exposed to the appropriate luciferin substrate. Photon emission can be detected by light sensitive apparatus such as a luminometer or modified optical microscopes.
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