Take the flies out of the freezer. Attach the abdomen of one frigid fly to each drop of glue.
把苍蝇取出来，把冷冻苍蝇的肚子粘在机翼的引擎位置上。
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。
Suddenly the fly finds itself pinned-under a downpour, of glue, as if in a Roman centurion 's net.
突然间苍蝇发现它自己被倾盆而下的粘胶粘住身子，犹如落入古罗马军团百夫长的网罩中。
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