我们生来知道上帝而且服从他。
其中有一个基本的假设条件：训练数据与测试数据来自相同的特征空间而且服从相同的概率分布。
There exists a basic assumption: the training data and test data are drawn from the same distribution and the same feature space.
战场的上的得利者说征募儿童士兵是近乎免费的，吃得很便宜而且很快就能服从命令。
Accounts from the field tell of soldiers who are near free to recruit, cheap to feed, and quick to follow orders.
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