This model can be used for any unknown data instance, and you are able to predict whether this unknown data instance will learn classification trees by asking them only two simple questions.
这个模型可用于任何未知的数据实例，来预测这个未知数据实例是否通过只询问两个简单问题就能理解分类树。
But who's to say the trees they chew don't contain some unknown bacterium that stops sheep becoming man-eaters?
但谁又敢说它们咀嚼的树木中也会含有那种防止羊吃人的未知细菌呢？
Unknown to Mum I had been selling Christmas trees shoveling snow and doing odd jobs to earn enough money to buy a new pair of boots.
我偷偷背着母亲，推销圣诞树、铲雪、做零工去挣钱，希望能够买一双新靴子。
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