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高中生物实验“叶绿体中色素的提取和分离”中要用到毛细吸管。毛细吸管可以用细玻璃管放在酒精喷灯上拉制而成，但是这种毛细玻璃吸管有许多缺点，比如易划破滤纸（划线困难）、易碎裂损坏（影响使用）和使用寿命短（消耗量很大）等等。笔者在实验教学中发现自动铅笔才是最好
The capillary pipette is used in the high school biology experiment “Extraction and Separation of Pigments in Chloroplasts.” Capillary straws can be drawn using a thin glass tube on an alcohol torch. However, this type of capillary glass pipette has many disadvantages, such as easy to scratch the filter paper (difficult line), breakage damage (impact use) and short service life (The consumption is very large) and so on. The author found that the mechanical pencil is the best in experimental teaching