The experiment is such: Researcher uses foam rubber or plastic from the female alar collect secretion, dissolve is in at the inunction after alcohol the labrum of a few females.

研究人员用海绵从下收集分泌物，溶于酒精后涂擦在一些的上唇。

Be like a trace still not take out, can twist a cotton cloth after the dip in Wenshui dry, inunction of on drop a few ammonia water, use glazing candle polish finally.

如痕迹仍未去掉，可将一块棉布在浸后拧干，滴上几滴氨涂擦，最后使用上光蜡抛光。