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But the milkweed has a defence mechanism.
不過馬利筋也有對(duì)策
As the caterpillar bites into a vein,
毛蟲只要咬破葉脈
a kind of latex swells out engulfing it.
葉子就會(huì)流出一種膠乳包住毛蟲
If the caterpillar isn't quick, it will drown...
如果毛蟲動(dòng)作太慢就會(huì)淹死
or find its jaws glued together.
或是被黏得張不開嘴
The plants' defence is so effective
馬利筋的防御機(jī)制相當(dāng)有效
that only one third of the Monarch caterpillars make it through the first day.
只有三分之一的毛蟲 能撐過第一天
But the caterpillars that survive, grow in size and strength.
大難不死的毛蟲 體型和力氣與日俱增
And they go for the jugular.
然后開始攻擊馬利筋的要害
By carefully chewing through the main vein,
它們小心地咬破主脈
the caterpillar drains the leaf of latex
讓葉片的膠乳流干
and cuts off its supply.
并阻斷其供應(yīng)
The milkweed's leaf is now defenceless
這下馬利筋的葉片 再也無力反擊
and the caterpillar eats in safety before preparing to pupate into a butterfly.
毛蟲可以放心大嚼，然后成蛹化蝶
