写作批改前：
Casting doubt on the theories mentioned in the reading passage about the purpose of the carved stone ball, the leturer gives her perspective contrary to the reading passage.
To begin with, according to the professor, many of the stones crack and break into pieces, also, the surface of them is not damaged. Thus it challenges the idea in the reading passage that carved stone balls were weapons.
In addition, supported by the second theory in the reading passage, carved stone balls may serve as part of a system of measures. However, the lecturer points out that the mass of the stone is to considerable. What's more, she also argues that the stone ball is combined with different sorts of stones, of which densities are exactly different. Therefore, the second theory is refuted by the lecturer.
Finally, the professor denies the view that carved stone balls stand for social status mentioned in the reading. She states that although some of them have complex pattern on them, most of the designs are too simple. Additionally, she says that there is also no stone balls found in tombs, which implies it can not be used as social purpose.
In summary, the professor illustrates her views by giving specific reasons and the theories in the reading proven to be biased and partial.
小站名师批改后：
Casting doubt on the theories mentioned in the reading passage about the purpose of the carved stone ball, the leturer [拼写错误]gives her perspective contrary to the reading passage. [最好可以总结一下到底是哪几个用途]
To begin with, according to the professor, many of the stones crack and break into pieces, also, the surface of them is not damaged. Thus it challenges the idea in the reading passage that carved stone balls were weapons. [非常的简洁，这点很好]
In addition, supported by the second theory in the reading passage, carved stone balls may serve as part of a [the] system of measures. However, the lecturer points out that the mass of the stone is to[注意拼写 considerable. What's more, she also argues that the stone ball is combined with different sorts of stones, of which densities are exactly different. [however那句意思表述不明，得重写]Therefore, the second theory is refuted by the lecturer. [最后一句多余，去掉]
Finally, the professor denies the view that carved stone balls stand for social status mentioned in the reading. She states that although some of them have complex pattern on them, most of the designs are too simple. Additionally, she says that there is also no stone balls found in tombs, which implies it can not [cannot] be used as social purpose. [最后一句叙述很好，简短却包含了较多的信息]
In summary, the professor illustrates her views by giving specific reasons and the theories in the reading proven to be biased and partial. [此段都可以去掉]
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