Instead, it secretes a glue and USES this to stick bits of sand together to form its casing, in the way that a freshwater caddis fly larva does.

堆沙蠕虫分泌出一种胶状物将沙石粘合在一起形成壳装，这一点类似于淡水石蛾的幼虫。

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Unless an infected larva kills the wasp egg, it hatches and the wasp larva eats its way out from inside the fruit fly larva, killing it.

除非受感染的果蝇幼虫杀死黄蜂卵，否则当黄蜂卵孵化出来后，黄蜂幼虫将会由内而外吞噬果蝇幼虫，将其杀死。

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