a hard taskmaster的用法和样例：
- When I was in the Army, Lt. Surge was my strict CO. He was a hard taskmaster .
- Inside the Department she was a hard taskmaster, who expected everyone to work as hard as she did.
- She was a hard taskmaster.
- He is a hard taskmaster.
- It's natural to slack2 off towards the end of a hard day's work.
- Let's collect the sap before its consolidation into a hard mass.