各位老师帮我看看我的剖析对不对？
① On October 23rd nearly 84,000 Americans testedpositive, a record. record是nearly 84,000的同位语。
② only about 40% of voters plan to cast ballots inperson on election day, though, a record low. 这里的low也是名词。
③ For 2021 the number is 40% higher: a record 235m. 同位语。其中235m是record的同位语，等于省略了of？
On October 23rd nearly 84,000 Americans tested positive, a record.
—— a record 应该是前文全句的同位语，等于 which was a record. 同位语可以用主表相等、交换地方去检验。
only about 40% of voters plan to cast ballots in person on election day, though, a record low.
——网友理解正确。 low 是名词“低值”。a record low.：历史最低值；记录最低值。
For 2021 the number is 40% higher: a record 235m.
——网友理解正确。加 of 更明确是同位关系。
