读点笑话学英语：犹如几个时辰

ZX68

As a band instructor at an elementary school, I require my students to turn in practice sheets signed by their parents so I can be sure they are putting in enough time.
作为一个小学的乐队指挥，为了确保学生投入足够的时间练习，我要求他们上交由他们父母签字的练习单。
I had to laugh, however, when one parent wrote on her child's sheet, &quotracticed 17 minutes, but it seemed like hours.
可是有一次，一位家长的签字把我逗乐了。练习单上写着：“练习了17分钟，但犹如几个时辰。”
【注释】

(1) band n.乐队

(2) instructor n.指挥

(3) turn in上交；归还

(4) signed by their parents:由他们的父母签名的。这是一个分词短语作定语修饰sheets.
(5) so I can be sure they are putting in enough time:这样我才能确定他们投入了足够的时间。这是so that 引导的目的状语从句，其中that省略。