Using allusions is using things, which is more common in poetry. Quoting stories or words from ancient books is a classic. You can express relevant content and ideas in a rich and implicit way. Cite allusions.
Liu Xie explained "allusions" in "Wen Xin Diao Long", saying that it was "based on events and taking the past as evidence to prove the present". It is used to compare the past and the present, to prove the present with the past, and to express one's feelings through the past. When using allusions, we should not only learn from what they refer to, but also bring forth new ideas. More importantly, we should be able to be similar in appearance but not show traces. The so-called "salt in water, drinking water is the taste of salt" is a masterpiece.