The existing problem in operation of siphonal sand filter and innovation were introduced.
介

吸式砂滤器在运行过程中
现的问题及改造
施。
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The juvenile stages of some insects, for example, have completely different kinds of mouths than their adult versions, like caterpillars, which use chewing mouthparts to devour leaves before metamorphosing into butterflies and moths with siphoning mouthparts.
例如许多昆虫的幼虫时期有着
成年时期完全不同的
类型,比如毛虫在变成

飞蛾之前
用咀嚼式

吞食叶子,而

飞蛾则是虹吸式
。