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可尝试扩展句子。越复杂的句子,分析结果越丰富。
You have three layers of skin which act as a barrier against disease.
这是一个复杂句。
You have three layers of skin which act as a barrier against disease.
You主语
have •••谓语动词短语
three layers of ··· disease.宾语
which act as a barrier against disease.
这是一个定语从句,其时态为一般现在时。
which主语
act as •••谓语动词短语
a barrier against disease.宾语