For the claim that sentience, ocupled with the ability to experience pleasure and pain, is sufficient for moral consideration. It is true that the ability to experience pleasure can be taken into account of moral consideration. However, it is not sufficient for moral consideration. First, it is difficult for us to accurately determine the pleasure and pain that owned by lives outside of human. For example, human did not kill dogs because they know dogs will show the damage by bark loudly. However, human can sometimes walk across the grass without any sympathy. It is due to human subjective thoughts that the grass does not bark to show the pain, neither does it give any expression after receving deamge. To conclude, determining the pain level is only according to human basic perspicacity instead of scientific methods. Moreover, to what level of pleasure and pain should human regard it as a prerequisite for moral consideration is still a mysterious question. Since every lives can feel the pain or pleasure for different levels, how to conclude the standard is far more complex even than determining whether one things can receive pain or pleasure. Therefore, the claim is problematic and complex to solve.