noun🔗SharePDF，便携式文档格式。 Portable Document Format"Please find the instructions for the assignment attached as a PDF. "请查看附件中作为 PDF 格式的作业说明。 (Qǐng chákàn fùjiàn zhōng zuòwéi PDF, biànxiéshì wéndàng géshì de zuòyè shuōmíng.)technologycomputinginternettechnicalcommunicationChat with AIVocabulary GamePractice Reading
noun🔗Share概率密度函数, 概率分布函数 Any function whose integral over a set gives the probability that a random variable has a value in that set"The teacher used the pdf of test scores to see how likely students were to get a passing grade. "老师使用了考试成绩的概率密度函数，来了解学生获得及格分数的可能性有多大。mathstatisticsChat with AIVocabulary GamePractice Reading
