1. Soon he was selling it by the slice.
    很快他又开始将肉切片出售，

2. Philosophers by selling wisdom and priests by selling spiritual comfort.
    哲学家靠卖智慧为生，牧师靠卖精神安慰为生。

3. It has been said that everyone lives by selling something.
    据说每个人都靠出售某种东西来维持生活。

4. In the light of this statement, teachers live by selling knowledge,
    根据这种说法，教师靠卖知识为生，