Researchers found that a spray of a solution containing thidiazuron, or TDZ, kept leaves and petals looking fresh and healthy for days longer than usual.

　　研究者们发现，这种喷雾中含有一种叫“脱叶灵”的物质，也可以称作“TDZ”，它可以使叶子和花瓣看着比它们能保持的时间更新鲜。