ect是怎么用的

是etc. 也就是et cetera,等等吧。就是放在并列列举的几个事物之后的。例子：
"Lords, Officers, Soldiers, etc."
---"All's Well that End's Well" by Shakespeare, William

"The whole being explained, many obliging things were said by the Miss Thorpes of their wish of being better acquainted with her; of being considered as already friends, through the friendship of their brothers, etc."
---Northanger Abbey by Austen, Jane