由于他的一些作品写作时间不详，从而一定程度上影响了对诗文本身以及对颜延之的深入研究。
However, the writing time of some of his works is still unknown, which has, to some extent, affected the in-depth research on him and his works.
如全书共有一百首回首诗，只有一首作品指出作者姓字而不详出处。
For example, in the whole book there were a hundred poems repeated.
如全书共有一百首回首诗，只有一首作品指出作者姓字而不详出处。
For example, in the whole book there were a hundred poems repeated.
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