Another nice context to think about this is in prolog. It is often the case that we can write a n-ary relation and then write a (n+1)-ary version that contains a tracing parameter. This tracing parameter is a proof object / witness.
BiomedicalMarch 2026MagazineFeature
，更多细节参见新收录的资料
Every day I answered the question on how healthy I felt. In the graph, the yellow color indicates that I felt a little under the weather, not sick per se. Red means I was sick and had to stay home. Green means I felt energized and healthy.
2025年，月均付费用户数创3400万新高（假如一个用户既是大会员又为游戏付费，则只计算一次）。
从古代京杭大运河到现代长江经济带，内河航运是中国经济的动脉之一。建议完善相关法律体系，规范内河航运行政管理和司法活动、内河航运运营主体的经营行为，促进长江经济带健康发展。